A pelvic prosthesis

Abstract

The present invention relates to a pelvic prosthesis, comprising a pelvic support and an acetabular cup, a connecting mechanism detachably mounted on the pelvic support and used to connect the acetabular cup; the connecting mechanism comprises a first connecting column mounted on the pelvic support, a second connecting column mounted on the acetabular cup, and a support arm for connecting the first connecting column and the second connecting column; the support arm is configured to restore the rotation center of the acetabular cup by adjusting the angle between the first connecting column and the pelvic support and the angle between the second connecting column and the acetabular cup. The acetabular rotation center restoration can meet the needs of different osteotomy situations, and has the characteristics of simple structure, mass production, wide applicability, and easy promotion.

Description

Technical Field

[0001] The invention belongs to the technical field of artificial prostheses, and in particular relates to a pelvic prosthesis. Background Art

[0002] The pelvis is composed of the left and right hip bones, acetabulum, sacrum, coccyx and the bone connections between them. Pelvic bone tumors are a common type of pelvic injury. Due to their complex structure and morphology, the resection of pelvic tumors is challenging.

[0003] Since the resection of pelvic tumors will cause bone defects, bone defects need to be reconstructed through the pelvis to achieve continuity and stability between the patient's pelvis and other bone tissues, so as to maintain the patient's necessary daily life, such as sitting, standing and walking.

[0004] For reconstruction after pelvic tumor resection, the prior art discloses a gear-type hemipelvis, see Figure 1 , which can realize the change of the acetabular anteversion angle, and can also realize the rotation center of the rotation in a circle around the trajectory of the screw 23, but it cannot rotate to other positions outside the circular trajectory. Even if the prosthesis is customized according to the tumor location, there is a situation where the actual rotation center of the acetabulum is inconsistent with the ideal rotation center due to inaccurate osteotomy during surgery, which may lead to hip dislocation, instability, left-right asymmetry, etc.

[0005] Since the location of the pelvic tumor in each patient is different, the degree of bone defect after tumor resection is different. However, the existing pelvic prosthesis cannot meet the applicability of patients with different degrees of bone defect and cannot effectively restore the acetabulum rotation center. Summary of the invention

[0006] To solve all or part of the above problems, the present invention provides a pelvic prosthesis that can solve the problem of restoring the acetabulum rotation center under different pelvic osteotomy conditions, increase the applicability of the pelvic prosthesis, and improve the satisfaction of patients after surgery.

[0007] The present invention provides a pelvic prosthesis, comprising a pelvic support and an acetabular cup, and a connecting mechanism detachably mounted on the pelvic support and used to connect the acetabular cup; the connecting mechanism comprises a first connecting column mounted on the pelvic support, a second connecting column mounted on the acetabular cup, and a support arm for connecting the first connecting column and the second connecting column; the support arm is configured to restore the rotation center of the acetabulum by adjusting the angle between the first connecting column and the pelvic support and the angle between the second connecting column and the acetabular cup.

[0008] Furthermore, the support arm is perpendicularly connected to the axial direction of the first connecting column and the axial direction of the second connecting column respectively.

[0009] Furthermore, the pelvic support includes a pelvic fixing seat and a mounting column vertically connected to the bottom of the pelvic fixing seat and used to connect to the first connecting column, and the first connecting column is coaxial with the mounting column.

[0010] Furthermore, the support arm is a plate member connecting the first connecting column and the second connecting column; the axial directions of the first connecting column and the second connecting column are parallel.

[0011] Furthermore, the first connecting column is provided with a first reinforcing column that can be accommodated in the inner cavity of the mounting column, and the mutually adjacent surfaces of the first connecting column and the mounting column are provided with first tooth grooves that occlude with each other, and the first connecting column and the mounting column are axially provided with through holes or threaded holes that can pass screws and are used to install the first connecting column on the mounting column.

[0012] Furthermore, the pelvic support includes a pelvic fixing seat and a mounting plate vertically connected to the bottom of the pelvic fixing seat, and a second reinforcing column capable of being accommodated in the inner cavity of the first connecting column is vertically arranged on the mounting plate.

[0013] Furthermore, the support arm includes a first plate body connected to the axial direction of the first connecting column in a perpendicular manner, and a second plate body connected to the first plate body and connected to the axial direction of the second connecting column in a perpendicular manner.

[0014] Furthermore, the included angle between the first plate body and the second plate body is 60°-120°.

[0015] Furthermore, mutually adjacent surfaces of the first connecting column and the mounting plate are provided with second tooth grooves that engage with each other, and the first connecting column is axially provided with a through hole or a threaded hole that can penetrate a screw and is used to install the first connecting column on the mounting plate.

[0016] Furthermore, the acetabular cup includes an acetabular cup body and a third reinforcing column connected to the acetabular cup body and capable of being accommodated in an inner cavity of the second connecting column, and mutually occlusal third tooth grooves are provided on mutually adjacent surfaces of the second connecting column and the acetabular cup body, and a through hole or a threaded hole is axially provided in the second connecting column, through which a screw can pass, and used to mount the acetabular cup on the second connecting column.

[0017] The pelvic prosthesis provided by the present invention has a connecting mechanism that can be detachably mounted on the pelvic support, and can replace connecting mechanisms of different sizes according to the actual osteotomy situation of the patient during surgery to meet the patient's needs for restoring the acetabulum rotation center. By designing the first connecting column of the connecting mechanism to be connected to the pelvic support, the connection stability between the connecting mechanism and the pelvic support and the angle range in which the connecting mechanism can rotate around the pelvic support can be increased. When adjusting the angle between the first connecting column and the pelvic support, the acetabulum rotation center can be adjusted to meet the restoration of the acetabulum rotation center of the patient under different osteotomy situations, which greatly improves the applicability of the pelvic prosthesis and reduces the occurrence of dislocation; by designing the second connecting column of the connecting mechanism to be connected to the acetabulum cup, the connection stability between the connecting mechanism and the acetabulum cup can be increased, and the acetabulum cup abduction angle can be adjusted arbitrarily to meet the needs of the patient during surgery.

[0018] The pelvic prosthesis of the present invention can meet the needs of restoring the acetabulum rotation center in different osteotomy situations, and has the characteristics of simple structure, mass production, wide applicability, and easy promotion. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following is a brief introduction to the drawings required for the specific embodiments or the description of the prior art. In all the drawings, similar elements or parts are generally identified by similar reference numerals. In the drawings, the elements or parts are not necessarily drawn according to the actual scale.

[0020] Figure 1 It is a schematic diagram of the structure of a gear-type hemi-pelvis disclosed in the prior art;

[0021] Figure 2 A schematic structural diagram of a pelvic prosthesis shown in an embodiment of the present invention;

[0022] Figure 3 for Figure 2 A schematic diagram of the assembly structure of the pelvic prosthesis shown;

[0023] Figure 4 for Figure 2 A schematic diagram of the top view of the pelvic prosthesis shown;

[0024] Figure 5 It is a schematic structural diagram of another pelvic prosthesis shown in an embodiment of the present invention;

[0025] Figure 6 for Figure 5 Schematic diagram of the assembly structure of the pelvic prosthesis shown.

[0026] Explanation of the accompanying drawings: pelvic prosthesis 100, pelvic support 1, pelvic fixing seat 101, mounting column 102, mounting plate 103, second reinforcement column 104, acetabular cup 2, acetabular cup body 201, third reinforcement column 202, connecting mechanism 3, first connecting column 301, first tooth groove 311, first reinforcement column 312, second tooth groove 313, second connecting column 302, third tooth groove 321, support arm 303, first plate body 331, second plate body 332. DETAILED DESCRIPTION

[0027] The following embodiments of the technical solution of the present invention are described in detail in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present invention, and are therefore only used as examples, and cannot be used to limit the protection scope of the present invention.

[0028] See also Figures 2 to 4 The present embodiment provides a pelvic prosthesis 100, comprising a pelvic support 1 and an acetabular cup 2, a connecting mechanism 3 detachably mounted on the pelvic support 1 and used to connect the acetabular cup 2; the connecting mechanism 3 comprises a first connecting column 301 mounted on the pelvic support 1, a second connecting column 302 mounted on the acetabular cup 2, and a support arm 303 used to connect the first connecting column 301 and the second connecting column 302; the support arm 303 is configured to restore the rotation center of the acetabulum by adjusting the angle between the first connecting column 301 and the pelvic support 1 and the angle between the second connecting column 302 and the acetabular cup 2.

[0029] The pelvic prosthesis 100 of this embodiment has a connection mechanism 3 that can be detachably mounted on the pelvic support 1, and can realize the matching use of connection mechanisms 3 of different specifications and sizes with the pelvic support 1 and the acetabular cup 2. Before the pelvic tumor resection operation, the osteotomy position of the patient can be checked through CT or X-ray film to prepare multiple connection mechanisms 3 of similar specifications and sizes. The connection mechanism 3 of corresponding specifications is selected according to the actual osteotomy position and size of the pelvis during the operation. When the pelvic prosthesis is installed, the angle between the first connection column 301 and the pelvic support 1 and the angle between the second connection column 302 and the acetabular cup 2 are adjusted according to the deflection of the acetabulum rotation center, so that the installation of the pelvic prosthesis coincides with the osteotomy position to achieve the restoration of the rotation center; if the osteotomy position is inconsistent with the expected position due to the tumor position being different from the prediction, the wrong osteotomy, etc., other specifications of connection mechanisms can also be selected to achieve the restoration of the rotation center.

[0030] By designing the first connecting column 301 of the connecting mechanism 3 to be connected to the pelvic support 1, the connection stability between the connecting mechanism 3 and the pelvic support 1 and the angular range of the connecting mechanism 3 that can rotate around the pelvic support 1 can be increased. When adjusting the angle between the first connecting column 301 and the pelvic support 1, the rotation center of the acetabulum cup 2 can be adjusted to meet the needs of the patient's acetabulum under different osteotomy conditions. The applicability of the pelvic prosthesis 100 is greatly improved and the occurrence of dislocation is reduced. By designing the second connecting column 302 of the connecting mechanism 3 to be connected to the acetabulum cup 2, the connection stability between the connecting mechanism 3 and the acetabulum cup 2 can be increased and the acetabulum cup 2 abduction angle can be arbitrarily adjusted to meet the needs of patients during surgery.

[0031] The support arm 303 in this embodiment is respectively connected to the axial direction of the first connecting column 301 and the axial direction of the second connecting column 302. When adjusting the angle between the first connecting column 301 and the pelvic support 1, the support arm 303 can rotate around the circumference of the first connecting column 301 and drive the acetabular cup 2 to rotate significantly with the support arm 303 as the rotation radius. Since the support arm is respectively connected to the axial direction of the first connecting column 301 and the axial direction of the second connecting column 302, the trajectory of the acetabular cup rotating around the first connecting column can be other trajectories outside the first connecting column as the center of the circle, which is far beyond the rotation trajectory of the acetabular cup in the gear-type hemi-pelvis of the prior art, significantly increasing the adjustable range of the acetabular cup, and facilitating the recovery of the acetabular rotation center under different osteotomy conditions.

[0032] By adjusting the size of the support arm 303, the height of the acetabular cup 2 rotating around the first connecting column 301 and the radius of the circular trajectory can be further expanded, thereby better meeting the consistency between the bone defect position and the installation position of the pelvic prosthesis 100 and achieving the restoration of the patient's acetabulum rotation center.

[0033] In one embodiment, see Figure 2 and Figure 3 The pelvic support 1 includes a pelvic fixing seat 101 and a mounting column 102 vertically connected to the bottom of the pelvic fixing seat 101 and used to connect to the first connecting column 301 , and the first connecting column 301 is coaxial with the mounting column 102 .

[0034] The support arm 303 in this embodiment is a plate member connecting the first connecting column 301 and the second connecting column 302; the axial direction of the first connecting column 301 is parallel to the axial direction of the second connecting column 302. The pelvic prosthesis 100 in this embodiment is suitable for preparing a series of connecting mechanisms 3 with different sizes and matching the pelvic support 1 and the acetabular cup 2, and can achieve the restoration of the acetabular rotation center under different osteotomy conditions when the pelvic prosthesis 100 is installed.

[0035] See also Figure 2 and Figure 4By rotating the angle between the first connecting column 301 and the mounting column 102, the plate body can make a circular rotation around the central axis of the first connecting column 301, so that the acetabular cup 2 can be adjusted to any position on the circular trajectory. By adjusting the angle between the second connecting column 302 and the acetabular cup 2, the anteversion angle of the acetabular cup 2 can be adjusted. By replacing the connecting mechanism 3 with plate bodies of different lengths and second connecting columns 302 of different lengths, the position of the acetabular cup 2 in the up and down directions and on the circular trajectory of different circumferential radii around the first connecting column 301 can be adjusted, thereby realizing the restoration of the acetabulum rotation center under different osteotomy conditions. The pelvic prosthesis 100 has the characteristics of strong versatility, high utilization rate, and easy mass production, which significantly reduces the preparation cost of the pelvic prosthesis 100.

[0036] In this embodiment, a series of connecting mechanisms 3 with plate lengths ranging from 0 to 100 mm and second connecting columns 302 with lengths ranging from 0 to 50 mm can be prepared. The user can select the corresponding connecting mechanism 3 according to the required osteotomy during surgery to prepare for the installation of the pelvic prosthesis 100.

[0037] See also Figure 4 In this embodiment, the first connection column 301 is provided with a first reinforcing column 312 that can be accommodated in the inner cavity of the mounting column 102, and the mutually adjacent surfaces of the first connection column and the mounting column 102 are provided with mutually engaged first tooth grooves 311, and the axial direction of the first connection column 301 and the mounting column 102 is provided with through holes or threaded holes that can penetrate screws and are used to install the first connection column 301 on the mounting column 102. By providing the first reinforcing column 312 on the first connection column 301, the connection area between the first connection column 301 and the mounting column 102 can be increased, and when the screw penetrates the first connection column 301 and installs it on the mounting column 102, it is beneficial to enhance the installation strength of the connection mechanism 3 on the pelvic support 1, and by providing the first tooth grooves 311 on the mutually adjacent surfaces of the first connection column 301 and the mounting column 102, the first tooth grooves 311 can be mutually engaged after adjusting the angle between the first connection column 301 and the mounting column 102, thereby playing a role in fixing the rotation angle of the first connection column 301.

[0038] In this embodiment, continue to refer to Figure 3The acetabular cup 2 includes an acetabular cup body 201 and a third reinforcing column 202 connected to the acetabular cup body 201 and capable of being accommodated in the inner cavity of the second connecting column 302, the second connecting column 302 and the acetabular cup body are provided with mutually occlusal third tooth grooves 321 on their mutually adjacent surfaces, the second connecting column 302 is axially provided with a through hole or a threaded hole through which a screw can pass and is used to install the acetabular cup 2 on the second connecting column 302, and a third tooth groove is provided on the mutually adjacent surfaces of the second connecting column and the acetabular cup and circumferentially arranged around the through hole or the threaded hole. The third reinforcing column on the acetabular cup is connected to the second connecting column, so that the connection area between the acetabular cup and the connecting mechanism can be enhanced. When the acetabular cup 2 is installed on the second connecting column 302 with the screw, the connection strength of the acetabular cup 2 on the connecting mechanism 3 can be ensured. By setting the third tooth groove 321 on the mutually adjacent surfaces of the second connecting column 302 and the acetabular cup 2, after adjusting the angle between the second connecting column 302 and the acetabular cup 2, the third tooth groove 321 can be mutually engaged, so that the second connecting column and the acetabular cup will no longer rotate around the screw as the axis, so that the connected artificial prosthesis structure is firm and does not deform.

[0039] The pelvic prosthesis 100 in this embodiment is applicable to any osteotomy situation. The cooperation between the pelvic prosthesis 100 and the osteotomy position can realize the restoration of the rotation center of the acetabulum, thereby fundamentally increasing the applicability of the pelvic prosthesis 100 .

[0040] In another embodiment, see Figure 5 and Figure 6 The pelvic support 1 includes a pelvic fixing seat 101 and a mounting plate 103 vertically connected to the bottom of the pelvic fixing seat 101. A second reinforcing column 104 capable of being accommodated in the inner cavity of the first connecting column 301 is vertically arranged on the mounting plate, thereby increasing the connection area between the pelvic support 1 and the connecting mechanism 2, which is conducive to enhancing the connection strength between the two. The pelvic prosthesis 100 in this embodiment is suitable for restoring the rotation center of the acetabulum, especially for the case where the rotation center of the acetabulum is out of the normal position.

[0041] In this embodiment, the support arm 303 includes a first plate 331 connected to the first connecting column 301 in a perpendicular direction and a second plate 332 connected to the first plate 331 and connected to the second connecting column 302 in a perpendicular direction. The connecting mechanism 3 of this embodiment can adjust the angle between the first connecting column 301 and the mounting plate 103 according to the osteotomy condition of the patient, so as to adjust the position of the acetabular cup 2 in the up-down direction, the position in the left-right direction and the abduction angle; by adjusting the angle between the second connecting column 302 and the acetabular cup 2, the anteversion angle of the acetabular cup 2 can be adjusted; by replacing the connecting mechanism 3 with the first plate 331 and the second plate 332 of different sizes, the position of the acetabular cup 2 in the front-back direction, the position in the left-right direction and the up-down direction can be adjusted. Compared with the gear-type semi-pelvic structure of the prior art, the pelvic prosthesis of this embodiment can adjust the acetabular cup to any position outside the circular rotation trajectory, and can further restore the rotation center of the acetabular cup 2 in any case where the rotation center of the acetabulum deviates from the normal position. It has the characteristics of strong versatility, high utilization rate, and easy mass production, which significantly reduces the preparation cost of the pelvic prosthesis 100 and helps to reduce the economic burden on patients.

[0042] In this embodiment, the angle between the first plate 331 and the second plate 332 is 60°-120°, and preferably the angle between the first plate 331 and the second plate 332 is 90°. Figure 2 The 90° angle design between the first plate 331 and the second plate 332 can enhance the connection strength between the first plate 331 and the second plate 332, thereby ensuring the stability of the connection between the pelvic support 1 and the acetabular cup 2 after the pelvic prosthesis 100 is installed.

[0043] In this embodiment, a series of connecting mechanisms 3 can be prepared with the first plate 331 having a length between 0-50 mm and the second plate 332 having a length between 0-50 mm. During surgery, the corresponding connecting mechanism 3 can be selected according to the required osteotomy conditions to meet the needs of installing the pelvic prosthesis 100.

[0044] The mutually adjacent surfaces of the first connecting column 301 and the mounting plate 103 are provided with second tooth grooves 313 that mesh with each other, and the axial direction of the first connecting column 301 is provided with a through hole or a threaded hole that can penetrate a screw and is used to install the first connecting column 301 on the mounting plate 103. The first connecting column 301 is installed on the mounting plate 103 by screws, which can ensure the installation strength of the connecting mechanism 3 on the pelvic support 1. By providing the second tooth grooves 313 on the mutually adjacent surfaces of the first connecting column 301 and the mounting plate 103, after adjusting the angle between the first connecting column 301 and the mounting plate 103, the second tooth grooves 313 can mesh with each other, thereby playing a role in fixing the rotation angle of the first connecting column 301.

[0045] In this embodiment, continue to refer to Figure 6 The acetabular cup 2 includes an acetabular cup body 201 and a third reinforcing column 202 connected to the acetabular cup body 201 and capable of being accommodated in the inner cavity of the second connecting column 302, the second connecting column 302 and the acetabular cup body are provided with mutually occlusal third tooth grooves 321 on their mutually adjacent surfaces, the second connecting column 302 is axially provided with a through hole or a threaded hole through which a screw can pass and is used to install the acetabular cup 2 on the second connecting column 302, and the third tooth grooves 321 are provided on the mutually adjacent surfaces of the second connecting column 302 and the acetabular cup 2 and are circumferentially arranged around the through hole or the threaded hole. The acetabular cup 2 is mounted on the second connecting column 302 by means of screws, so that the connection strength of the acetabular cup 2 on the connecting mechanism 3 can be ensured; and by providing the third tooth groove 321 on the mutually adjacent surfaces of the second connecting column 302 and the acetabular cup 2, after adjusting the angle between the second connecting column 302 and the acetabular cup 2, the third tooth groove 321 can be engaged with each other, so that the second connecting column and the acetabular cup will no longer rotate around the screw as the axis, so that the connected artificial prosthesis structure is firm and does not deform.

[0046] In the description of the above embodiments, it should be understood that the directions or positional relationships indicated by the terms "up", "down", "left", "right", "front", "back", etc. are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation on the present invention.

[0047] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein by equivalents. These modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present invention, and they should all be included in the scope of the claims and specification of the present invention.

Claims

1. A pelvic prosthesis, comprising a pelvic support and an acetabular cup, characterized in that: Also included is a connecting mechanism detachably mounted on the pelvic support and used to connect the acetabular cup; The connecting mechanism comprises a first connecting column mounted on the pelvic support, a second connecting column mounted on the acetabular cup, and a support arm for connecting the first connecting column and the second connecting column, the support arm being respectively connected perpendicularly to the axial direction of the first connecting column and the axial direction of the second connecting column, the support arm being a plate member connecting the first connecting column and the second connecting column, and the axial direction of the first connecting column is parallel to the axial direction of the second connecting column; The support arm is configured to adjust the angle between the first connecting column and the pelvic support so that the plate member can perform a circular rotation around the central axis of the first connecting column to adjust the rotation center of the acetabular cup, adjust the angle between the second connecting column and the acetabular cup to adjust the abduction angle of the acetabular cup, and adjust the length of the plate member and the length of the second connecting column to adjust the position of the acetabular cup in the vertical direction and on the circumferential trajectory of different circumferential radii around the first connecting column, thereby restoring the rotation center of the acetabulum. Wherein, the pelvic support includes a pelvic fixing seat and a mounting column vertically connected to the bottom of the pelvic fixing seat and used to connect the first connecting column, the first connecting column is coaxial with the mounting column; the first connecting column is provided with a first reinforcing column which can be accommodated in the inner cavity of the mounting column, the first connecting column and the mounting column are provided with first tooth grooves which occlude with each other on adjacent surfaces thereof, and the first connecting column and the mounting column are axially provided with through holes or threaded holes which can penetrate screws and are used to install the first connecting column on the mounting column; the acetabular cup includes an acetabular cup body and a third reinforcing column which is connected to the acetabular cup body and can be accommodated in the inner cavity of the second connecting column, the second connecting column and the acetabular cup body are provided with third tooth grooves which occlude with each other on adjacent surfaces thereof, and the second connecting column is axially provided with through holes or threaded holes which can penetrate screws and are used to install the acetabular cup on the second connecting column.

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