A cartilage defect repair device

Abstract

The present invention discloses a cartilage defect repairing device, characterized in that it comprises: a carrier and a fixer; the fixer is fixedly arranged on the top of the carrier, the carrier is in the shape of a cylinder with a top seal, and the side wall is provided with a through hole, the fixer comprises a locking block with a front end that can expand and penetrate into the bone, and a pressurizer is provided inside the locking block for spreading the locking block to all sides; the device penetrates into the bone of the patient through the fixator, and provides a carrier body with a through hole, when actually used, the device is placed in the cartilage defect, the autologous cartilage or other repair material for repair is placed in the carrier body of the device, a fixed foundation is given to the repair material, rubber is filled in the traditional direct repair material, the repair material can be more stably attached to the bone surface, no matter the size of the defect area, the filler can be stably fixed; it is beneficial to the one-time repair and shaping of the cartilage, improves the repair quality, and avoids secondary damage to the repaired joint.

Description

Technical Field

[0001] The invention belongs to the technical field of cartilage repair, and in particular relates to a cartilage defect repairing device. Background Art

[0002] Cartilage is cartilage tissue, which is composed of chondrocytes and intercellular matrix. The matrix in cartilage is in a gel state and has great toughness. Cartilage is a connective tissue that mainly supports the bones. It does not contain blood vessels and lymphatic vessels. Nutrients penetrate from the blood vessels in the perichondrium into the intercellular matrix and then nourish the bone cells. There are only some cartilages scattered in the adult body, and their functions vary depending on the location. For example, articular cartilage exists on the joint surface of bones, which plays an important role in the human body, such as bearing load and reducing bone friction between joints.

[0003] Articular cartilage defects are very common in orthopedic clinics. Patients often experience joint pain and limited mobility, which seriously affect their quality of life and even lead to disability. Currently, for severe osteoarthritis with large cartilage defects, when conservative treatment is ineffective, artificial joint replacement or autologous cartilage transplantation and filler repair are generally performed; however, when autologous cartilage or filler repair is used, there is a lack of a repair body for the repair material, and the repair material cannot be stably placed at the site to be repaired or the end of the patient's bone, so that the final repaired cartilage cannot be completely fitted with the original cartilage or bone tissue, affecting the patient's joint movement and even causing secondary damage.

[0004] While the load-bearing prosthesis is attached to the surface of the patient's bone tissue, the entire device is stably fixed, which also greatly affects the precise repair of the cartilage; therefore, there is a need for a cartilage defect repair device that can bear a cartilage prosthesis and be stably fixed on the patient's bone surface. Summary of the invention

[0005] In order to solve the above technical problems, the present invention designs a cartilage defect repair device, which can stably place the repair object on the patient's bone surface through the mutual cooperation of the repair body and the fixing device to facilitate accurate cartilage repair.

[0006] In order to achieve the above technical effects, the present invention is implemented by the following technical solutions: a cartilage defect repair device, characterized in that it includes: a repair body, a fixing device;

[0007] The fixing device is fixedly arranged at the bottom of the repair body, the repair body is a porous cylindrical structure with a smooth surface, the fixing device is a needle-shaped hollow structure, the front end of which is provided with a locking block that can expand and penetrate into the bone, and the interior is provided with a pressurizer that stretches the locking block to the surroundings.

[0008] Furthermore, the repair body is cylindrical, and its lower end surface is a plane, the fixing devices are distributed in a triangular shape on the top of the repair body, and the midpoints of the fixing devices are connected to form an isosceles triangle;

[0009] Furthermore, the lower end surface of the repair body fits the end surface of the cartilage to be repaired, and the surface is smooth;

[0010] Furthermore, the repair body is a cylindrical shape with a triangular cross section, and the side surface of the repair body is concave inward into an arc; the bottom of the repair body is a plane, and the fixing devices are respectively fixedly connected to the tripods on the top of the repair body;

[0011] Furthermore, the lower end surface of the repair body fits the end surface of the cartilage that needs to be repaired;

[0012] Furthermore, the fixing device is in the form of a hollow cylindrical tube, the outer circumference of the locking block is fixed with a locking nail, and the circumferential diameter of the inner cavity of the locking block gradually decreases from bottom to top; the pressurizer is a screw, the top of which is fixed with a support cylinder with a diameter greater than the inner diameter of the locking block, the pressurizer is threadedly connected to the inner cavity of the fixing device, and the bottom hexagonal sleeve is connected with an adjuster;

[0013] Furthermore, the locking nail is in the shape of a barb inclined toward one side of the repair body;

[0014] Furthermore, the regulator includes a hexagonal column and an adjusting cap, the adjusting cap is fixed to the tail end of the hexagonal column, and a clamping block is fixed on the outer periphery of the adjusting cap; an annular groove penetrating through the inner cavity of the fixing device is provided in the side wall at the tail end, and a rectangular groove penetrating to the annular groove is provided on the bottom end surface of the fixing device;

[0015] Another object of the present invention is to provide a method for preparing a cartilage defect repair device, characterized in that the whole three-dimensional model of the cartilage at the cartilage defect of the patient is first obtained by three-dimensional scanning, a three-dimensional model of the cartilage defect site is reversely generated based on the three-dimensional model, a repair body model is prepared by 3D printing based on the three-dimensional model of the cartilage defect site, and a repair body to be implanted in the human body is prepared based on the repair body model; the size of the repair body is smaller than the outer circumference diameter of the cartilage defect;

[0016] The beneficial effects of the present invention are:

[0017] 1. The present invention designs a bearing device for repairing cartilage defects. The device penetrates into the bone of the patient through a fixing device and provides a bearing body with a through hole. When actually used, the device is placed in the cartilage defect, and the autologous cartilage or other repair material for repair is placed in the bearing body of the device, giving the repair material a fixed foundation. The rubber is filled in the traditional direct repair material, which can make the repair material fit more stably to the bone surface. Regardless of the size of the defect area, the filler can be stably fixed; it is beneficial to the one-time repair and shaping of the cartilage, improve the repair quality, and avoid secondary damage to the repaired joint;

[0018] 2. The present invention provides a fixing device fixed to a piece of bone, and an expandable locking block is provided on the top of the fixing device. The locking block is expanded so that the locking nails on its periphery are inserted into the patient's bone to achieve stable fixation and ensure that the fixing device will not fall out. Compared with the traditional prosthesis-bearing fixing device, the fixation is more stable; and the fixing device adopts a multi-stage fastening form, that is, the locking block is propped open by a movable support rod, and finally the whole can be inserted into the fixing device to achieve complete inner cavity locking. Compared with other locking forms, exposure of external components is avoided; and such locking form, compared with the fixed hook form, can be freely taken out after locking, avoiding the limitation of one-way locking. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings required for describing the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying creative work.

[0020] Figure 1 It is a schematic diagram of the overall structure of a cartilage defect repair device;

[0021] Figure 2 is a schematic diagram of a second embodiment of a cartilage defect repair device;

[0022] Figure 3 is a schematic diagram of a third embodiment of a cartilage defect repair device;

[0023] Figure 4 is a schematic diagram of a cartilage defect repairing device according to embodiment 4;

[0024] Figure 5 It is a schematic diagram of a fixing device of a cartilage defect repair device and its accessory structures;

[0025] Figure 6 is a schematic cross-sectional view of a fixation device of a cartilage defect repair device;

[0026] Figure 7 is a schematic structural diagram of a sixth embodiment of a cartilage defect repair device;

[0027] In the accompanying drawings, the components represented by the reference numerals are listed as follows:

[0028] 1-repair body, 11-through hole, 2-fixing device, 21-locking block, 22-locking nail, 23-pressurizer, 24-spreading cylinder, 25-adjuster, 26-annular groove, 27-rectangular groove, 28-adjusting cap, 29-hexagonal column, 30-block. DETAILED DESCRIPTION

[0029] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings required for describing the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying creative work.

[0030] Example 1

[0031] See also Figure 1 As shown, a cartilage defect repair device is characterized by comprising: a repair body, a fixing device;

[0032] The fixing device is fixedly arranged on the top of the repair body, the repair body is in the shape of a cylinder with a sealed top and a through hole on the side wall, the fixing device comprises a locking block with a front end that can be expanded to penetrate into the bone, and a pressurizer is arranged inside to open the locking block to all sides;

[0033] The repair body is cylindrical, and its lower end face is a plane. The fixing devices are distributed in a triangular shape on the top of the repair body, and the line connecting the midpoints of the fixing devices is an isosceles triangle. The triangularly fixed fixing device can ensure stable support of the repair body in all directions when it is inserted into the patient's bone. The triangle is an isosceles triangle, which ensures that the external force generated by the repair body can be evenly dispersed on the three fixing devices in the same plane, avoiding bone cracking or damage to the cartilage that has begun to be repaired due to uneven force during the cartilage repair process. The lower end face of the repair body is a smooth surface.

[0034] Example 2

[0035] The difference between this embodiment and the above-mentioned embodiment 1 is that:

[0036] The lower end surface of the repair body fits the end surface of the cartilage to be repaired. Figure 2 As shown, this allows for a better fit in the subsequent rotation of the joints, avoiding secondary damage to the joints due to insufficient coupling.

[0037] Example 3

[0038] The difference between this embodiment and the above-mentioned embodiment 1 is that:

[0039] The repair body is in the shape of a cylinder with a triangular cross section, and the side surface of the repair body is concave inwardly into an arc; Figure 3 As shown, the repair body can be used in conjunction with a cylindrical repair body, that is, the inner concave arc surface of the repair body fits the outer convex surface of the cylindrical repair body, so that the repair body can be filled with the affected area that needs cartilage repair; in this way, the filler can be completely filled in the repair body to ensure that the repair body stably carries the filler; the bottom of the repair body is a plane, and the fixing devices are respectively fixedly connected to the tripods on the top of the repair body.

[0040] Example 4

[0041] The difference between this embodiment and the above-mentioned embodiment 3 is that:

[0042] The lower end surface of the repair body fits the end surface of the cartilage that needs to be repaired and is a smooth surface.

[0043] Example 5

[0044] Based on the above embodiment 1:

[0045] See also Figure 5 , 6 As shown, the fixing device is in the form of a hollow cylindrical tube, and a locking nail is fixed on the outer circumference of the locking block, and the circumferential diameter of the inner cavity of the locking block gradually decreases from bottom to top; the pressurizer is a screw, and a spreading cylinder with a diameter larger than the inner ring diameter of the locking block is fixed on the top, the pressurizer is threadedly connected to the inner cavity of the fixing device, and an adjuster is connected to the hexagonal sleeve at the bottom; the adjuster twists the pressurizer, and the pressurizer rotates to push the spread cylinder upward, because the outer circumferential diameter of the spread cylinder is larger than the inner ring diameter of the locking block, and the inner ring diameter of the locking block gradually decreases from bottom to top, that is, the more the spread cylinder moves upward, the greater the spread limit of the locking block.

[0046] The adjuster includes a hexagonal column and an adjusting cap, wherein the adjusting cap is fixed only at the tail end of the hexagonal column, and a clamping block is fixed on the outer periphery of the adjusting cap; an annular groove penetrating through its inner cavity is provided in the side wall at the tail end of the fixing device, and a rectangular groove penetrating to the annular groove is provided on the bottom end face of the fixing device; after the adjuster is adjusted into place by the adjuster, the adjusting cap at its outermost end is also completely immersed in the fixing device, and the clamping block enters the annular groove from the rectangular groove, and after rotating again, the clamping block is completely clamped in the annular groove, thereby realizing the locking and fixation of the entire fixing device, and all the fixing components of the fixing device are completely placed in the inner cavity of the fixing device, which can avoid excessive exposure and secondary damage to the joints.

[0047] Example 6

[0048] Based on the above-mentioned embodiment 5, the locking nail in this embodiment is configured as a barbed hook that is inclined toward one side of the repair body, so that it can be more stably held when inserted into the bone to prevent it from falling out.

[0049] Example 7

[0050] A method for preparing a cartilage defect repair device, characterized in that, firstly, a three-dimensional model of the whole cartilage at the cartilage defect of a patient is obtained by three-dimensional scanning, a three-dimensional model of the cartilage defect site is reversely generated according to the three-dimensional model, a repair body model is prepared by 3D printing according to the three-dimensional model of the cartilage defect site, and then a repair body to be implanted into a human body is prepared according to the repair body model;

[0051] The size of the repair body is smaller than the outer diameter of the cartilage defect to ensure that the repair body can be completely placed in the cartilage defect, that is, the repair object can completely fill the defect site that needs to be repaired.

[0052] In summary, the present invention designs a bearing device for repairing cartilage defects, which penetrates into the patient's bone through a fixing device and provides a bearing body with a through hole. In actual use, the device is placed in the cartilage defect, and the autologous cartilage or other repair material used for repair is placed in the bearing body of the device, giving the repair material a fixed foundation. The rubber is filled in the traditional direct repair material, which can make the repair material fit more stably to the bone surface. Regardless of the size of the defect area, the filler can be stably fixed; it is beneficial to the one-time repair and shaping of the cartilage, improves the repair quality, and avoids secondary damage to the repaired joint.

[0053] The preferred embodiments of the present invention disclosed above are only used to help illustrate the present invention. The preferred embodiments do not describe all the details in detail, nor do they limit the invention to the specific implementation methods described. Obviously, many modifications and changes can be made according to the content of this specification. This specification selects and specifically describes these embodiments in order to better explain the principles and practical applications of the present invention, so that those skilled in the art can understand and use the present invention well. The present invention is limited only by the claims and their full scope and equivalents.

Claims

1. A cartilage defect repair device, characterized in that: include: A repair body and a fixing device; the repair body is a porous cylindrical structure with a smooth surface; the fixing device is fixedly arranged at the bottom of the repair body and is a needle-shaped hollow structure, with a locking block that can expand and penetrate into the bone at the front end, and a pressurizer that stretches the locking block to the surroundings inside; The repair body is cylindrical, and its upper end surface is a plane. The fixing devices are distributed in a triangular shape at the bottom of the repair body, and the midpoints of the fixing devices are connected to form an isosceles triangle. The repair body is porous, with smooth upper and lower end surfaces and a cylindrical shape, and the side surface of the repair body is concave inward into an arc; the fixing devices are respectively fixedly connected to the tripod at the bottom of the repair body; the outer circumference of the locking block of the fixing device is fixed with a locking nail, and the circumferential diameter of the inner cavity of the locking block gradually decreases from bottom to top; the pressurizer is a screw, and a support cylinder with a diameter larger than the inner circle diameter of the locking block is fixed on the top, the pressurizer is threadedly connected to the inner cavity of the fixing device, and an adjuster is connected to the hexagonal sleeve at the bottom; The adjuster includes a hexagonal column and an adjusting cap, wherein the adjusting cap is fixedly arranged at the tail end of the hexagonal column, and a clamping block is fixedly arranged on the outer periphery of the adjusting cap; an annular groove penetrating through the inner cavity of the fixing device is arranged in the side wall at the tail end, and a rectangular groove penetrating through the annular groove is arranged on the bottom end face of the fixing device.

2. A cartilage defect repair device according to claim 1, characterized in that: The upper end surface of the repair body fits the surface of the cartilage that needs to be repaired.

3. A cartilage defect repairing device according to claim 1, characterized in that: The lower end surface of the repair body fits the subchondral bone surface that needs to be fixed, and fits the surface of the subchondral calcification layer.

4. A cartilage defect repairing device according to claim 1, characterized in that: The locking nail is in the shape of a barb inclined toward one side of the repair body.

5. A method for preparing a cartilage defect repairing device according to any one of claims 1 to 4, characterized in that: First, a three-dimensional model of the whole cartilage at the patient's cartilage defect is obtained through three-dimensional scanning, and a three-dimensional model of the cartilage defect site is reversely generated based on the three-dimensional model. Based on the three-dimensional model of the cartilage defect site, a repair body model is prepared through 3D printing, and then a repair body to be implanted into the human body is prepared based on the repair body model; the size of the repair body is smaller than the outer circumferential diameter of the cartilage defect.

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