Height-adjustable artificial vertebra

Abstract

The present invention relates to the field of medical devices, and more particularly to a height-adjustable artificial vertebral body. The artificial vertebral body comprises a core rod portion, a sleeve portion, and an end cap portion. The core rod portion comprises a lower end face and a core rod, and a plurality of locking bosses are provided on the core rod. The inner side of the sleeve is provided with a guide groove, a limit groove, a locking groove, and a limit plate. The core rod and the inner side of the sleeve cooperate with each other, and the end cap portion is provided with a rotation groove that matches the rotation platform of the sleeve, thereby achieving reciprocating height adjustment to achieve an optimal height, and can effectively maintain the immediate and long-term stability of the lesion site of the human spine, so that the patient can restore the physiological curvature.

Description

Technical Field

[0001] The present invention relates to the field of medical devices, and in particular to a height-adjustable artificial vertebral body. Background Art

[0002] With the advancement of materials science and science and technology, the integration of medicine and engineering has become increasingly close, and various difficult and complicated diseases have been effectively treated. The spine, as one of the three major pillars of orthopedics, has developed particularly rapidly. Artificial vertebrae are a commonly used clinical medical device product used to replace the intervertebral and vertebral parts of the human spine to effectively treat corresponding spinal diseases.

[0003] There are currently two types of products that are widely used in the market. The first is the traditional titanium mesh product, which is a long mesh structure that is cut and used according to the patient's needs during surgery. Since this product needs to be cut during surgery, the height of the cut product is often inaccurate, the two ends of the product are uneven, and there are many burrs and spikes, which can easily cause damage to the upper and lower final versions, causing collapse and displacement. The second is the movable artificial vertebral body. During the use of this product, the height is often adjusted before implantation (and it is a one-way adjustment). It cannot be adjusted after implantation and cannot be trimmed a second time. Summary of the Invention

[0004] The present invention provides a height-adjustable artificial vertebra, the purpose of which is to achieve reciprocating adjustment of the height of the artificial vertebra to obtain an optimal height, and effectively maintain the immediate and long-term stability of the lesion site of the human spine, so that the patient can restore the physiological curvature.

[0005] In order to achieve the above objectives, an embodiment of the present invention provides a height-adjustable artificial vertebral body, specifically comprising:

[0006] The core rod portion includes a lower end surface and a core rod, the lower end surface is a cylinder, a first fixing tooth is provided on the circular surface of the lower end cylinder, and a first clamping hole is provided on the side surface of the lower end cylinder; a height scale and a plurality of locking bosses are provided on the core rod, and the distribution of the locking bosses includes radial uniform distribution and axial uniform distribution;

[0007] The sleeve part is cylindrical, and the outer side of the sleeve is provided with a second clamping hole, a locking direction mark, and a locking tooling hole. The inner side of the sleeve matches the core rod and is provided with an array of adjustable locking mechanisms; one end of the sleeve is provided with a rotating platform;

[0008] The end cover part includes an upper end surface and an inner rotation groove, and the inner rotation groove matches the rotating table and is used for rotation locking of the sleeve part.

[0009] Furthermore, the radially distributed locking bosses are provided in 2-3 groups, with 1-8 locking bosses in each group uniformly arranged along the axial direction.

[0010] Furthermore, a limiting groove and a limiting bead are provided on the locking boss, and the limiting groove and the limiting bead are connected via a limiting spring.

[0011] Furthermore, the number of groups of the adjustment locking mechanisms provided on the inner side of the sleeve is the same as the number of groups of the radially distributed locking bosses.

[0012] Furthermore, the adjustment locking mechanism specifically includes an axially arranged guide groove and a limit plate, and an array of limit grooves and locking grooves are arranged along the direction of the cylindrical section. The direction of the arrangement sequence of the guide groove, limit groove, locking groove and limit plate is consistent with the direction of the locking direction mark.

[0013] Furthermore, the distance between each set of limiting grooves and locking grooves is equal to the unit adjustment height, and the unit adjustment height is 2-5 mm.

[0014] Furthermore, the distance between the locking bosses along the axial direction is an integer multiple of the unit adjustment height, and the unit adjustment height is 2-5 mm.

[0015] Furthermore, a plurality of second fixing teeth are provided on the upper end surface of the end cover, and a guardrail is provided around the upper end surface.

[0016] Furthermore, the lower end surface of the core rod, the outer side of the sleeve and the end cover are all provided with porous structures.

[0017] Furthermore, the preparation materials of the artificial vertebral body include: PEEK, pure titanium, titanium alloy and pure tantalum.

[0018] Beneficial effects:

[0019] (1) The present invention provides multiple groups of limiting grooves and locking grooves in the sleeve of the artificial vertebra, and axially provides a guide groove and a limiting plate to cooperate with the core rod, and the other end of the sleeve is provided with a rotating table to cooperate with the rotating groove of the end cover. By rotating the sleeve, the height of the artificial vertebra can be adjusted without removing it, thereby obtaining the optimal height and shortening the operation time.

[0020] (2) The upper and lower end surfaces of the artificial vertebra of the present invention adopt a porous structure, which can contact the vertebra over a large area, reduce the occurrence of complications such as collapse and displacement of the artificial vertebra after implantation, effectively maintain the immediate and long-term stability of the lesion site of the human spine, and restore the patient's physiological curvature. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 is a schematic diagram of a height-adjustable artificial vertebral body provided by the present invention;

[0022] Figure 2 Schematic diagram of the height-adjustable artificial vertebral core rod provided by the present invention;

[0023] Figure 3 Schematic diagram of the height-adjustable artificial vertebral body sleeve provided by the present invention;

[0024] Figure 4 It is a cross-sectional view of the height-adjustable artificial vertebral body sleeve provided by the present invention;

[0025] Figure 5 It is a schematic diagram of the height-adjustable artificial vertebral body end cover provided by the present invention.

[0026] [Description of Reference Numerals]

[0027] 1. Core rod part; 1-1. Lower end face of core rod; 1-2. First fixing tooth; 1-3. First clamping hole; 1-4. Core rod; 1-5. Locking boss; 1-6. Limiting bead; 1-7. Height gauge; 2. Sleeve part; 2-1. Second clamping hole; 2-2. Locking direction mark; 2-3. Locking tool hole; 2-4. Rotating table; 2-5. Guide groove; 2-6. Core rod assembly hole; 2-7. Limiting groove; 2-8. Locking groove; 2-9. Limiting plate; 3. End cover part; 3-1. Upper end face; 3-2. Guardrail; 3-3. Rotating grass; 3-4. Second fixing tooth. DETAILED DESCRIPTION

[0028] In order to make the technical problems, technical solutions and advantages to be solved by the present invention clearer, a detailed description will be given below with reference to the accompanying drawings and specific embodiments.

[0029] The present invention provides a height-adjustable artificial vertebra, the purpose of which is to achieve reciprocating adjustment of the height of the artificial vertebra to obtain an optimal height, and effectively maintain the immediate and long-term stability of the lesion site of the human spine, so that the patient can restore the physiological curvature.

[0030] like Figure 1 As shown, an embodiment of the present invention provides a height-adjustable artificial vertebral body, which specifically includes a core rod portion 1 , a sleeve portion 2 , and an end cover portion 3 .

[0031] like Figure 2As shown, the core rod portion 1 includes a lower end face 1-1 and a core rod 1-4, the lower end face is a cylinder, and a first fixing tooth 1-2 is provided on the circular surface of the lower end cylinder. The first fixing teeth 1-2 are symmetrically distributed and are used to fix the artificial vertebra on the spine to ensure the stability of the artificial vertebra in the body. A first clamping hole 1-3 is provided on the side of the lower end cylinder to facilitate the use of surgical clamping tools to perform corresponding operations on the artificial vertebra during surgery to achieve implantation of the artificial vertebra; the core rod 1-4 is integrated with the lower end face 1-1 The core rod 1-4 is provided with a height scale 1-7 for indicating the adjusted height. The core rod is provided with locking bosses 1-5. The distribution of the locking bosses includes radial uniform distribution and axial uniform distribution. The radially distributed locking bosses 1-5 are provided in 2-3 groups, with 1-8 locking bosses 1-5 in each group evenly distributed along the axial direction. The distance between the locking bosses in the axial direction is an integer multiple of the unit adjustment height. The unit adjustment height is 2-5mm, and the unit adjustment height can generally be set to 3mm. The locking bosses 1-5 are provided with limiting grooves, and the limiting grooves and the limiting beads 1-6 are connected by limiting springs. The core rod 1-4, the fixing teeth 1-2, and the clamping hole 1-3 are made of hard biomaterial, and the other parts of the lower end surface are made of porous material.

[0032] like Figure 3 、 4As shown, the sleeve part is cylindrical with a core rod mounting hole 2-6 inside. The outer side of the sleeve is provided with a second clamping hole 2-1, a locking direction mark 2-2 and a locking fixture hole 2-3. The second clamping hole 2-1 is for facilitating the use of surgical clamping tools to perform corresponding operations on the artificial vertebra during surgery to achieve the implantation of the artificial vertebra; the locking direction mark 2-2 is used to indicate the direction of locking the artificial vertebra; the locking fixture hole 2-3 is provided in a middle position close to the sleeve part 2, and is used to fix the surgical fixing rod in the locking fixture hole 2-3 for locking during surgery; the inner side of the sleeve part 2 matches the core rod 1-4, and is provided with an array of adjustment locking mechanisms. The adjustment locking mechanism provided on the inner side of the sleeve is the same as the number of groups of the radially distributed locking bosses, and the adjustment locking mechanism specifically includes an axially arranged The guide groove 2-5 and the limit plate 2-9 are arranged, and an array of limit grooves 2-7 and locking grooves 2-8 are arranged along the direction of the cylindrical section. Each group of limit grooves 2-7 and locking grooves 2-8 are on the same circumference. The guide grooves 2-5, limit grooves 2-7, locking grooves 2-8 and limit plates 2-9 are arranged in a sequential direction consistent with the direction indicated by the locking direction mark 2-2. The locking grooves 2-8 are arranged to prevent the core rod 1-4 from automatically reversing, and the limit plates 2-9 are arranged to prevent the core rod 1-4 from excessive rotation; the distance between each group of limit grooves 2-7 and locking grooves 2-8 is equal to the unit adjustment height, and the unit adjustment height is 2-5mm, generally 3mm; the starting end of the limit groove 2-7 is located in the limit groove 2-7, so as to realize efficient and accurate height adjustment, and a rotating table 2-4 is provided at one end of the sleeve 2.

[0033] like Figure 5 The end cover part 3 includes an upper end face 3-1 and an inner rotation groove 3-3, a second fixed tooth 3-4 is provided on the circular surface of the upper end face 3-1, a guardrail 3-2 is provided around the upper end face 3-1, and the rotation groove 3-3 matches the rotating table of the sleeve part for rotation locking of the sleeve part.

[0034] The artificial vertebral body is composed of multiple parts. Except for the locking boss 1-5 and the limiting beads (including spring components) 1-6, which are processed by traditional machinery and then assembled with the core rod part 1, the other parts are integrally formed using 3D printing technology and then assembled as a whole. The sterilized artificial vertebral body is implanted into the patient's lesion site using a surgical clamping tool, and then fixed in the clamping hole 1-3 / 2-1 using a clamp. The height of the artificial vertebral body is adjusted to the height required by the patient by the clamp. During the process, the height value of the adjusted height is further confirmed by the height marked with the height scale 1-7; then two fixing rods are used to be fixed in the clamping hole 1-3 and the locking tooling hole 2-3 respectively. The movable core rod part 1 is fixed with one hand through the two fixing rods, and the fixing rod is pushed in the direction of the locking direction mark with the other hand until the second push is blocked and stops. Height adjustment process: The movable core rod part 1 slides along the guide groove 2-5, and is blocked once each time it is pushed, indicating that the limit bead 1-6 is neutralized with the limit groove 2-7. The height adjustment is a unit adjustment height, which can be adjusted by 3mm. After adjusting to the appropriate height, it is locked in the locking direction. At this time, the limit bead 1-6 rotates along the limit groove 2-7. The first block indicates that it has reached the end of the limit groove 2-7. After the second push, it is blocked, and the limit bead 1-6 coincides with the locking groove 2-8, indicating that the sleeve part 2 is locked in place. If the height needs to be lowered, first rotate it in the opposite direction to return the boss 1-5 to the guide groove 2-5, then lower it to the desired height, and then lock it in the locking direction again.

[0035] The height-adjustable artificial vertebra described in the present invention is made of medical materials with excellent biological properties such as PEEK, pure titanium, titanium alloy, and pure tantalum, combined with 3D printing technology and traditional mechanical processing technology. The artificial vertebra consists of multiple parts, and its upper and lower end surfaces are fully porous and have large-surface contact, which reduces or even eliminates the occurrence of postoperative complications such as collapse and displacement. During the doctor's operation, the height of the product can be adjusted directly after implantation in the patient's body without losing stability. There is no need to remove the product to adjust the height, which shortens the operation time.

[0036] The above is a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present invention. These improvements and modifications should also be regarded as within the scope of protection of the present invention.

Claims

1. A height-adjustable artificial vertebral body, characterized in that: Specifically include: The core rod portion includes a lower end face and a core rod, the lower end face is a cylinder, a first fixing tooth is provided on the circular surface of the cylinder of the lower end face, and a first clamping hole is provided on the side surface of the cylinder of the lower end face; a height scale and several locking bosses are provided on the core rod, and the distribution mode of the locking bosses includes radial uniform distribution and axial uniform distribution. The radially distributed locking bosses are provided in 2-3 groups, and each group has 1-8 locking bosses evenly arranged along the axial direction; a limiting groove and a limiting bead are provided on the locking boss, and the limiting groove and the limiting bead are connected by a limiting spring; The sleeve portion is cylindrical, and the outer side of the sleeve is provided with a second clamping hole, a locking direction mark, and a locking tooling hole. The inner side of the sleeve matches the core rod and is provided with an array of adjustment locking mechanisms; one end of the sleeve is provided with a rotating table; the adjustment locking mechanism specifically includes an axially arranged guide groove and a limit plate, and an array of limit grooves and locking grooves are provided along the direction of the cylindrical cross section. The starting end of the limit groove is located in the guide groove, and the arrangement order of the guide groove, limit groove, locking groove and limit plate is consistent with the direction of the locking direction mark; an end cover portion, the end cover comprising an upper end surface and an inner rotation groove, the inner rotation groove matching the rotation stage and being used for rotation locking of the sleeve portion; Among them, the height adjustment process is as follows: the core rod part slides along the guide groove, and is blocked once after each push, which means that the limiting bead is engaged with the limiting groove. After adjusting to the appropriate height, it is rotated and locked in the locking direction. At this time, the limiting bead rotates along the limiting groove. The first obstruction indicates that the limiting bead reaches the end point of the limiting groove. After continuing to rotate, it is blocked again. The limiting bead coincides with the locking groove, indicating that the sleeve part is locked in place.

2. The height-adjustable artificial vertebral body according to claim 1, characterized in that: The number of groups of the adjusting locking mechanisms arranged on the inner side of the sleeve is the same as the number of groups of the radially distributed locking bosses.

3. The height-adjustable artificial vertebral body according to claim 1, characterized in that: The distance between each set of limiting grooves and locking grooves is equal to the unit adjustment height, and the unit adjustment height is 2-5 mm.

4. The height-adjustable artificial vertebral body according to claim 1, characterized in that: The distance between the locking bosses along the axial direction is an integer multiple of the unit adjustment height, and the unit adjustment height is 2-5 mm.

5. The height-adjustable artificial vertebral body according to claim 1, characterized in that: A plurality of second fixing teeth are arranged on the upper end surface of the end cover, and a guardrail is arranged around the upper end surface.

6. The height-adjustable artificial vertebral body according to claim 1, characterized in that: The lower end surface of the core rod, the outer side of the sleeve and the end cover are all provided with porous structures.

7. The height-adjustable artificial vertebral body according to claim 1, characterized in that: The preparation materials of the artificial vertebral body include: PEEK, pure titanium, titanium alloy and pure tantalum.

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