Acetabular prosthesis

Abstract

The utility model belongs to the technical field of medical instruments, and particularly discloses an acetabular prosthesis which comprises an acetabular cup installed in an acetabular fossa. The acetabular cup and the filling block are connected in an embedded and clamped mode through the anti-rotation structure, and the acetabular cup and the filling block are fixed together through the first fixing nail. And the fixed wing is connected with the filling block and is fixed on the ilium wing. By means of the anti-rotation structure, when a patient implanted with the acetabular prosthesis moves and dislocation and slippage occur between the filling block and the acetabular cup, the first fixing nail cannot slightly move under the action of shearing force, the shearing force is borne by the anti-rotation structure, and the service life of the acetabular prosthesis is prolonged. According to the acetabular prosthesis, the first bone grafting groove and the supporting table are arranged on the filling block at intervals, the second bone grafting groove is formed in the acetabular cup, the weight of the acetabular prosthesis is reduced, autogenous bones or allogeneic bones of a patient can be implanted into the first bone grafting groove and the second bone grafting groove, the acetabular prosthesis is effectively prevented from loosening for a long time after being implanted, and the survival rate of the acetabular prosthesis is increased.

Description

Technical Field

[0001] The utility model belongs to the technical field of medical devices, and in particular relates to an acetabulum prosthesis. Background Art

[0002] The incidence of DDH (congenital dysplasia of the hip) in my country is about 0.9‰ to 3‰. Patients with DDH type III or DDHIV usually have anterosuperior or posterosuperior defects on the acetabulum side. In order to improve the patient's mobility function, the most effective way at present is to replace the bone defect with an artificial acetabular prosthesis to remove the lesion, eliminate pain, and restore the patient's mobility function.

[0003] Artificially manufactured acetabular prostheses mainly consist of an acetabular cup and a filler block. The filler block can fill the bone defect in the cavity, making the patient's bone defect more complete and effectively improving the fixation effect of the acetabular prosthesis. The acetabular prosthesis and the filler block are often fixed together with a fixing screw. However, the connection method using only fixing screws has the following problems:

[0004] After the patient has the acetabular prosthesis implanted, dislocation and slippage will occur between the filling block and the acetabular cup during the patient's activities. As a result, the fixing pin will be subjected to shear force, causing micro-movement of the fixing pin and affecting the functional effect of the acetabular prosthesis. Utility Model Content

[0005] The utility model aims to provide an acetabular prosthesis. When a patient implanted with the acetabular prosthesis is moving, when a filling block and an acetabular cup are dislocated or slipped, the fixing pins will not be subjected to shear force and micro-move, thereby improving the service life of the acetabular prosthesis.

[0006] The purpose of the utility model is achieved through such a technical solution, an acetabular prosthesis, comprising:

[0007] acetabular cup;

[0008] The acetabular cup and the filling block are engaged and connected via an anti-rotation structure, and the acetabular cup and the filling block are fixed together by a first fixing nail; and

[0009] Fixed wing, connected to the filling block.

[0010] Preferably, the anti-rotation structure is a cross-shaped anti-rotation structure, which includes a cross-shaped anti-rotation groove and a cross-shaped anti-rotation ridge adapted to the cross-shaped anti-rotation groove. The cross-shaped anti-rotation groove is arranged on the outer wall of the acetabular cup, and the cross-shaped anti-rotation ridge is arranged on the inner wall of the filling block.

[0011] Preferably, the outer wall of the acetabular cup is provided with a limiting groove that matches the outer shape of the filling block, and the cross-shaped anti-rotation groove is provided in the limiting groove.

[0012] Preferably, a first bone grafting groove and a support platform are spaced apart on the connection side of the filling block and the acetabular cup, and a second bone grafting groove matching the first bone grafting groove is provided in the limiting groove.

[0013] Preferably, the width of the support platform is 5-10 mm, and the width of the first bone grafting groove is 5-10 mm.

[0014] Preferably, the fixing wing extends toward and fits the iliac wing, and comprises a fixing wing body extending toward and fitting the iliac wing and fixing pins, wherein a plurality of fixing pins are spaced apart on the end surface of the fixing wing body facing the iliac wing.

[0015] Preferably, the fixing wing body is provided with a plurality of second through-threaded holes at intervals, the hole walls of the second through-threaded holes extend toward the filling block, and the second fixing nails obliquely pass through the second through-threaded holes to fix the fixing wing body on the iliac wing.

[0016] Preferably, the filling block and the fixing wing are integrally formed.

[0017] Preferably, the acetabular cup is provided with a first through-threaded hole, the filling block is provided with a third through-threaded hole connected to the first through-threaded hole, the first fixing nail obliquely passes through the first through-threaded hole and the third through-threaded hole, and the first fixing nail fixes the acetabular cup and the filling block.

[0018] Due to the adoption of the above technical solution, the beneficial effects of the utility model are:

[0019] The above-mentioned acetabular prosthesis has an anti-rotation structure that engages and engages the acetabular cup and the filling block, and the first fixing pin fixes the acetabular cup and the filling block together. The anti-rotation structure can effectively prevent micro-movement between the acetabular cup and the filling block when the first fixing pin is tightened. The shear force is borne by the anti-rotation structure. Therefore, when the patient with the implanted acetabular prosthesis is moving and the filling block and the acetabular cup are dislocated and slipped, the first fixing pin will not be affected by the shear force and micro-move, thereby improving the service life of the acetabular prosthesis. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the specific embodiments of the present invention, the following briefly introduces the drawings required for use in the specific embodiments. In all the drawings, each element or part is not necessarily drawn according to the actual scale.

[0021] Figure 1 This is a schematic structural diagram of an acetabular prosthesis according to the present invention;

[0022] Figure 2 It is a schematic diagram of the structure of the acetabular prosthesis combined with the human bone;

[0023] Figure 3 Schematic diagram of the structure of the acetabular cup;

[0024] Figure 4 Schematic diagram of the combination of acetabular cup and filler;

[0025] Figure 5 Schematic diagram of the structure of the filling block and fixed wing.

[0026] Reference numerals:

[0027] 1-acetabular cup, 11-cross-shaped anti-rotation groove, 12-limiting groove, 13-second bone graft groove, 14-first through-threaded hole, 15-fourth through-threaded hole, 2-filling block, 21-cross-shaped anti-rotation ridge, 22-first bone graft groove, 23-support platform, 24-third through-threaded hole, 3-fixing wing, 31-fixing wing body, 311-second through-threaded hole, 32-fixing pin, 4-first fixing nail, 5-second fixing nail, 6-third fixing nail, 7-iliac wing, 8-acetabular fossa. DETAILED DESCRIPTION

[0028] See also Figure 1 and Figure 2 An acetabular prosthesis includes an acetabular cup 1, a filling block 2, and a fixing wing 3. The acetabular cup 1 and the filling block 2 are connected by an anti-rotation structure interlocking clip, and a first fixing pin 4 fixes the acetabular cup 1 and the filling block 2 together. The fixing wing 3 is connected to the filling block 2.

[0029] Specifically, the acetabular cup 1, filler block 2, and fixator wing 3 are 3D-printed using existing EBM (Electron Beam Melting) technology. The acetabular cup 1, filler block 2, and fixator wing 3 are preferably made of a titanium alloy, which has an elastic modulus close to that of the human femur. After processing, the bone interface of the acetabular prosthesis exhibits a porous, trabecular-like structure with a porosity of 50% to 80%. This enhances the initial stability of the acetabular prosthesis, facilitates autologous bone ingrowth, and achieves long-term biofixation of the acetabular prosthesis. The acetabular cup 1 is hollow and hemispherical and is provided with multiple fourth through-threaded holes 15. Third fixation screws 6 pass through these fourth through-threaded holes 15 to secure the acetabular cup 1 to the patient's acetabular fossa 8. The acetabular cup 1 is rotationally connected to the femur. The bone interface profile of the acetabular cup 1 can be customized based on the patient's CT data to ensure a perfect fit between the acetabular cup 1 and the acetabular defect. The filler block 2 and fixator wing 3 conform perfectly to the acetabular defect and the iliac wing 7, enhancing fixation effectiveness. The fixing wing 3 is fixed on the iliac wing 7 .

[0030] The acetabular prosthesis in the present invention is a 3D-printed acetabular prosthesis customized according to the individual characteristics of the human body, which matches the actual defects of the human body, so that the acetabular prosthesis fully fits the human bone and promotes the effect of autologous bone ingrowth. The acetabular cup 1 and the filling block 2 are connected by an anti-rotation structure. The anti-rotation structure effectively prevents micro-movement between the acetabular cup 1 and the filling block 2, plays a positioning and anti-rotation role, and can also bear the shear force by the cross anti-rotation structure when the first fixing nail 4 is tightened, and the fixing nail is not subjected to shear force, thereby improving the life of the acetabular prosthesis.

[0031] Further, see Figure 3 、 Figure 4 and Figure 5 The anti-rotation structure is a cross-shaped anti-rotation structure, including a cross-shaped anti-rotation groove 11 and a cross-shaped anti-rotation ridge 21 adapted to the cross-shaped anti-rotation groove 11. The cross-shaped anti-rotation groove 11 is arranged on the outer wall of the acetabular cup 1, and the cross-shaped anti-rotation ridge 21 is arranged on the inner wall of the filling block 2.

[0032] Specifically, because the acetabular cup 1 is hemispherical, the cross anti-rotation structure is an inclined surface. The cross anti-rotation groove 11 is an iso-depth groove, and the inner wall width of the cross anti-rotation groove 11 is equal to the outer wall width of the cross anti-rotation ridge 21, so that the filling block 2 is embedded in the acetabular cup 1. With this structure, the cross anti-rotation groove 11 not only positions the filling block 2 when installing it, ensuring that they are correctly aligned and remain stable; it can also concentrate stress on the edge of the cross anti-rotation groove 11, disperse stress, reduce the degree of stress concentration, and thus improve tensile strength and fatigue resistance; and increase the contact area between the acetabular cup 1 and the filling block 2, thereby improving the friction and anti-slip performance of the acetabular cup 1 and the filling block 2, and increasing stability. With this structure, the first fixing nail 4 fixes the acetabular cup 1 and the filling block 2. When the patient is moving, the cross anti-rotation structure plays a role in positioning and anti-rotation when the first fixing nail 4 is tightened. When the first fixing pin 4 is tightened, the shear force is borne by the cross-shaped anti-rotation structure, and the first fixing pin 4 is not subjected to the shear force. This effectively prevents the first fixing pin 4 from loosening due to the shear force after implantation, thereby improving the lifespan of the acetabular prosthesis. Preferably, the number and size of the cross-shaped anti-rotation structures can be determined by the size of the acetabular cup 1 and the filling block 2. It should be noted that the cross-shaped anti-rotation groove 11 can be provided on the inner wall of the filling block 2, and correspondingly, the cross-shaped anti-rotation ridge 21 is provided on the outer wall of the acetabular cup 1.

[0033] Further, see Figure 3The outer wall of the acetabular cup 1 is provided with a limiting groove 12 that matches the shape of the filling block 2, and the cross-shaped anti-rotation groove 11 is set in the limiting groove 12. The limiting groove 12 not only serves as a limiting mark during installation, facilitating the positioning of the filling block 2 and allowing for quick installation, but also, after the filling block 2 is installed, the limiting groove 12 restricts the movement and rotation of the filling block 2, preventing misalignment or slippage between the filling block 2 and the acetabular cup 1, thereby reducing the shear force acting on the cross-shaped anti-rotation structure.

[0034] Further, see Figure 3 and Figure 5 A first bone grafting groove 22 and a support platform 23 are spaced apart on the connection side of the filling block 2 and the acetabular cup 1, and a second bone grafting groove 13 that cooperates with the first bone grafting groove 22 is provided in the limiting groove 12. On the one hand, the first bone grafting groove 22 can reduce the weight of the filling block 2, and the second bone grafting groove 13 can reduce the weight of the acetabular cup 1; on the other hand, the first bone grafting groove 22 can be implanted with the patient's autologous bone or allogeneic bone, and then the patient's autologous bone or allogeneic bone can be extended into the second bone grafting groove 13. After the bone grafting block is recombined with the filling block 2 and the bone surface of the pelvic acetabulum defect, the filling block 2 and the human pelvis can form a three-dimensional fixed form. This three-dimensional fixed form can effectively prevent the occurrence of long-term loosening of the acetabular prosthesis after implantation and improve the survival rate of the acetabular prosthesis. The bone interface contour of the filling block 2 can be customized according to the patient's CT data to ensure that the filling block 2 is fully fitted with the acetabular defect and the iliac wing 7, thereby improving the fixation effect.

[0035] Further, see Figure 5 , the width of the support platform 23 is 5-10mm, and the width of the first bone grafting groove 22 is 5-10mm. The support platform 23 can effectively prevent the bone collapse under the acetabular prosthesis. The number of support platforms 23 can be determined by the size of the filling block 2. The width of the first bone grafting groove 22 is between 5-10mm, which can ensure sufficient autologous bone implantation, ensure the bone ingrowth effect after implantation, and thus ensure the long-term fixation effect of the acetabular prosthesis. The number of the first bone grafting grooves 22 can be determined by the size of the filling block 2, and the second bone grafting groove 13 corresponds to the first bone grafting groove 22.

[0036] Further, see Figure 5The fixing wing 3 extends toward the iliac wing 7 and fits the iliac wing 7, and includes a fixing wing body 31 extending toward and fitting the iliac wing 7 and a fixing pin 32. A plurality of fixing pins 32 are spaced apart on the end surface of the fixing wing body 31 facing the iliac wing 7. Specifically, the front end of the fixing pin 32 has a sharp portion, which is easy to penetrate into the iliac wing 7. The fixing wing body 31 can be designed according to the size and shape of the patient's CT scan to maximize the effect of filling the defect and fitting the iliac wing 7. This can prevent the entire acetabular prosthesis from being flipped and dislocated due to the upward force, thereby preventing the acetabular prosthesis from failing. Preferably, two fixing pins 32 are provided. When in use, a positioning hole that matches the fixing pin 32 is provided in the iliac wing 7. The fixing pin 32 is inserted into the positioning hole to achieve initial stabilization, and then further fixed by the second fixing nail 5.

[0037] Further, see Figure 1 and Figure 4 The fixing wing body 31 is provided with a plurality of second through-threaded holes 311 at intervals. The walls of the second through-threaded holes 311 extend toward the filler block 2. The second fixing nail 5 obliquely passes through the second through-threaded holes 311 to secure the fixing wing body 31 to the iliac wing 7. The walls of the second through-threaded holes 311 obliquely extend toward the filler block 2, increasing the area of ​​the inner wall of the second through-threaded holes 311, improving the contact area between the second fixing nail 5 and the filler block 2, and thus enhancing the fixing strength.

[0038] Further, see Figure 5 The filling block 2 and the fixing wing 3 are integrally formed to enhance the strength of the acetabulum.

[0039] Further, see Figure 4 The acetabular cup 1 is provided with a first through-threaded hole 14, and the filler block 2 is provided with a third through-threaded hole 24 that communicates with the first through-threaded hole 14. The first fixing pin 4 obliquely passes through the first through-threaded hole 14 and the third through-threaded hole 24, thereby securing the acetabular cup 1 and the filler block 2. Specifically, the first through-threaded hole 14 and the third through-threaded hole 24 are arranged radially of the acetabular cup 1, thereby increasing the area of ​​the inner walls of the first through-threaded hole 14 and the third through-threaded hole 24, thereby increasing the contact area between the first fixing pin 4 and the through-threaded hole 14, thereby enhancing the fixing strength.

[0040] In the above-mentioned acetabular prosthesis, the acetabular cup 1, the filling block 2 and the fixing wing 3 can be designed in size and shape according to the patient's CT scan, so as to maximize the effect of filling the defect and fitting the bone surface, thereby improving the initial stability of the acetabular prosthesis system. The acetabular cup 1 and the filling block 2 are assembled through the limiting groove 12 and the cross-shaped anti-rotation structure is interlocked and fastened, so as to prevent displacement and rotation between the acetabular cup 1 and the filling block 2. The first fixing nail 4 fixes the acetabular cup 1 and the filling block 2 together. The anti-rotation structure can effectively prevent micro-movement between the acetabular cup 1 and the filling block 2 when the first fixing nail 4 is tightened. The shear force is borne by the anti-rotation structure. Therefore, when the patient with the implanted acetabular prosthesis is moving, when the filling block 2 and the acetabular cup 1 are dislocated or slipped, the fixing nail will not be subjected to the shear force and micro-movement occurs, thereby improving the long-term stability of the acetabular prosthesis and increasing the service life of the acetabular prosthesis.

[0041] The specific implementation methods described above further illustrate the purpose, technical solutions and beneficial effects of the utility model in detail. It should be understood that the above is only a specific implementation method of the utility model and is not intended to limit the utility model. Any modifications, equivalent replacements and improvements made within the scope of the present utility model should be included in the scope of protection of the present utility model.

Claims

1. An acetabular prosthesis, characterized in that: include: Acetabular cup (1); The filling block (2) is engaged with the acetabular cup (1) and the filling block (2) through an anti-rotation structure, and the first fixing pin (4) fixes the acetabular cup (1) and the filling block (2) together; and The fixed wing (3) is connected to the filling block (2).

2. The acetabular prosthesis according to claim 1, characterized in that The anti-rotation structure is a cross-shaped anti-rotation structure, which comprises a cross-shaped anti-rotation groove (11) and a cross-shaped anti-rotation ridge (21) adapted to the cross-shaped anti-rotation groove (11). The cross-shaped anti-rotation groove (11) is arranged on the outer wall of the acetabulum cup (1), and the cross-shaped anti-rotation ridge (21) is arranged on the inner wall of the filling block (2).

3. The acetabular prosthesis according to claim 1 or 2, characterized in that: The outer wall of the acetabulum cup (1) is provided with a limiting groove (12) that matches the outer shape of the filling block (2), and the cross-shaped anti-rotation groove (11) is arranged in the limiting groove (12).

4. The acetabular prosthesis according to claim 3, characterized in that A first bone grafting groove (22) and a support platform (23) are spaced apart on the connection side between the filling block (2) and the acetabulum cup (1), and a second bone grafting groove (13) matching the first bone grafting groove (22) is provided in the limiting groove (12).

5. The acetabular prosthesis according to claim 4, characterized in that The width of the support platform (23) is 5-10 mm, and the width of the first bone grafting groove (22) is 5-10 mm.

6. The acetabular prosthesis according to claim 1, 2, 4 or 5, characterized in that: The fixing wing (3) extends toward the iliac wing (7) and fits the iliac wing (7), and comprises a fixing wing body (31) extending toward and fitting the iliac wing (7) and a fixing needle (32), wherein a plurality of fixing needles (32) are arranged at intervals on the end surface of the fixing wing body (31) facing the iliac wing (7).

7. The acetabular prosthesis according to claim 6, characterized in that The fixing wing body (31) is provided with a plurality of second through-threaded holes (311) at intervals, the hole walls of the second through-threaded holes (311) extend toward the filling block (2), and the second fixing nail (5) obliquely passes through the second through-threaded holes (311) to fix the fixing wing body (31) on the iliac wing (7).

8. The acetabular prosthesis according to claim 1, 2, 4, 5 or 7, characterized in that: The filling block (2) and the fixed wing (3) are integrally formed.

9. The acetabular prosthesis according to claim 1, 2, 4, 5 or 7, characterized in that: The acetabular cup (1) is provided with a first through-threaded hole (14), the filling block (2) is provided with a third through-threaded hole (24) communicating with the first through-threaded hole (14), and the first fixing nail (4) obliquely passes through the first through-threaded hole (14) and the third through-threaded hole (24). The first fixing nail (4) fixes the acetabular cup (1) and the filling block (2).

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