CN111166535A

CN111166535A - Glenoid prosthesis with locking support

Info

Publication number: CN111166535A
Application number: CN202010105241.8A
Authority: CN
Inventors: 张海宁; 冷萍
Original assignee: Affiliated Hospital of University of Qingdao
Current assignee: Affiliated Hospital of University of Qingdao
Priority date: 2020-02-20
Filing date: 2020-02-20
Publication date: 2020-05-19

Abstract

The present invention provides a shoulder glenoid prosthesis with locking support. The shoulder glenoid prosthesis with locking support is divided into left and right sides, and includes a shoulder glenoid base, a bridge locking plate, a cover sheet, and a bridge screw. The above structures are matched and used to form A stable combination system for conventional glenoid replacement, or for glenoid replacement with bone defect, especially for revision or fracture cases with anterior or posterior glenoid bone defect. After the glenoid prosthesis with locking support is implanted into the articular surface of the scapula to be replaced by implantation instruments, good overall initial stability can be obtained, fretting can be reduced, and near-, mid- and long-term loosening caused by this can be avoided. The bridging locking plate can lock the thick bone of the glenoid base and the posterior border of the scapula, especially suitable for the bone defect in the anterior or posterior part of the glenoid, which can reduce stress concentration, improve the surgical effect, and prolong the service life of the prosthesis. Improve the overall long-term effect.

Description

Glenoid prosthesis with locking support

Technical Field

The invention belongs to the technical field of special prostheses for replacing scapular glenoid, in particular to a glenoid prosthesis with a locking support.

Background

The artificial shoulder joint replacement is an effective means for treating end-stage shoulder joint diseases such as osteoarthritis and complex fracture, but for the cases of posterior or anterior bone defects of the combined shoulder pelvis, such as failed revision after shoulder joint replacement and complex fracture cases, the conventional prosthesis has poor effect, the bone defects can cause local stress concentration of the prosthesis, generate a 'Trojan effect', and cause the loosening rate of the short-term or long-term shoulder pelvis prosthesis to be increased. Prostheses for such more complex cases are currently lacking.

Disclosure of Invention

The invention aims to provide a glenoid prosthesis with a locking support, which can replace a glenoid when a bone defect exists in the glenoid part, can reduce local stress concentration of the bone defect, disperse local stress, improve the operation effect and prolong the service life of the prosthesis.

The invention designs a glenoid prosthesis with a locking support for solving the problems in the prior art, can be used for replacing the conventional glenoid prosthesis and can also be used for merging bone defect cases, thereby enhancing the overall initial stability, reducing complications such as looseness and the like and having the effect of prolonging the service life of the prosthesis.

In order to solve the technical problems, the invention adopts the following technical scheme:

the patent refers to the field of 'prostheses for artificial bodies'. Comprises a shoulder and pelvis base, a bridging locking plate, a cover plate and a bridging screw. The upper surface and the lower surface of the base of the shoulder pelvis are both provided with a certain curvature, and the outer contour is circular or elliptical. The middle part of the lower surface of the shoulder and pelvis base is connected with a tower-shaped keel, the body part of the tower-shaped keel is provided with annular teeth which are gradually narrowed, and the head part of the tower-shaped keel is a blunt end. The lower surface of the base of the shoulder cup and the surface of the tower-shaped keel are subjected to roughening treatment such as spraying. The middle part of the upper surface of the shoulder and pelvis base is provided with a hole with certain taper and closed blind end, and the hole extends to a certain depth inside the tower-shaped keel. The upper surface of the base of the shoulder spittoon is distributed with 4 screw holes at certain intervals, and the screw threads are arranged in the screw holes. The left lower quadrant or the right lower quadrant of the upper surface of the shoulder and pelvis base is close to the edge, a part of the area is absent, the thickness of the absent part is 1/2 of that of the shoulder and pelvis base, and the absent part is provided with 2 screw holes with internal threads. The thickness of the cover plate is 1/2 of that of the base of the shoulder pelvis, the size of the cover plate is the same as that of the defect part in the left lower quadrant or the right lower quadrant of the base of the shoulder pelvis, and the surface curvature is consistent with that of the upper surface of the base of the shoulder pelvis. The surface of the cover plate is provided with 2 screw holes with internal threads, the positions of the screw holes correspond to the screw holes at the positions where the shoulder spittoon bases are absent, and the diameters of the screw holes of the cover plate are larger than those of the screw holes at the positions where the shoulder spittoon bases are absent. The bridging locking plate is divided into a head part and a body part which are connected at a certain angle, the head part has the same size as the cover plate, and 2 screw holes with the same size as the screw holes of the cover plate are also formed in the same part. The body part is in a narrow and long plate shape and is provided with a plurality of screw holes with threads inside. The length of the bridging screw is the same as the thickness of the base of the shoulder-cup, the diameter of the head part is the same as the diameter of the screw hole of the cover plate, and the diameter of the body part is the same as the diameter of the screw hole at the defect position of the base of the shoulder-cup.

The structures are matched and used to form a stable combination system for the replacement of a conventional glenoid prosthesis or for the replacement of a glenoid prosthesis for the combination of bone defects, in particular for the revision or fracture cases of bone defects in front of or behind the combined glenoid.

The base of the shoulder pelvis is matched with the bridging locking plate for use, so that a strong and stable combination system can be formed. The connecting of the shoulder pelvis base and the bridging locking plate can increase the overall stability, offset the uneven stress of the shoulder pelvis base caused by the bone defect at the back of the shoulder pelvis, disperse the local stress and improve the overall long-term effect.

The locking support glenoid prosthesis described above, which is made of a metal or an alloy.

According to the glenoid prosthesis with the locking support, the upper surface and the lower surface of the glenoid base both have a certain curvature, and the outer contour is circular or elliptical.

According to the glenoid prosthesis with the locking support, the middle part of the lower surface of the glenoid base is connected with the tower-shaped keel.

According to the glenoid prosthesis with the locking support, the tower-shaped keel body part in the middle of the lower surface of the glenoid base is provided with the annular teeth which are gradually narrowed, and the head part is a blunt tail end.

According to the glenoid prosthesis with the locking support, the hole with a certain taper and closed blind end is formed in the middle of the upper surface of the glenoid base and extends to a certain depth in the tower-shaped keel.

According to the glenoid prosthesis with the locking support, the lower surface of the base of the glenoid and the surface of the tower-shaped keel are subjected to roughening treatment such as spraying.

According to the glenoid prosthesis with the locking support, 4 screw holes are distributed on the upper surface of the base of the glenoid at intervals, and the screw threads are arranged in the screw holes.

The glenoid prosthesis with the locking support is characterized in that the left lower quadrant or the right lower quadrant of the upper surface of the glenoid base is close to the edge, and partial area is deficient.

According to the glenoid prosthesis with the locking support, 2 screw holes are formed in the partial area defect positions of the upper surface of the glenoid base, and the screw holes are internally provided with internal threads.

The locking support glenoid prosthesis is characterized in that the thickness of the cover plate is 1/2 of that of the base of the glenoid.

The glenoid prosthesis with the locking support is characterized in that the size of the cover plate is the same as that of the defect part of the left lower quadrant or the right lower quadrant of the glenoid base.

The locking support glenoid prosthesis described above, the cover sheet surface curvature conforms to the upper surface of the base of the glenoid.

The locking support shoulder and pelvis prosthesis is characterized in that the surface of the cover plate is provided with 2 screw holes with internal threads.

According to the glenoid prosthesis with the locking support, the screw hole on the surface of the cover plate corresponds to the screw hole at the defect position of the base of the glenoid.

The glenoid prosthesis with the locking support is characterized in that the screw hole of the cover plate is larger than the screw hole at the position of the base of the glenoid.

The locking support shoulder and pelvis prosthesis is characterized in that the head part and the body part of the bridging locking plate are connected at an angle.

The length of the bridging screw is the same as the thickness of the base of the shoulder pelvis.

The locking support glenoid prosthesis described above, the bridging screw head diameter being equal to the cover plate screw hole diameter.

The glenoid prosthesis with the locking support is characterized in that the diameter of the body of the bridging screw is equal to that of the screw hole at the defect position of the base of the glenoid.

The glenoid prosthesis with the locking support can obtain good initial stability after being implanted into the scapula articular surface needing replacement by using an implantation instrument, and the thick bone at the back edge of the glenoid base and the scapula can be locked by using the bridging locking plate.

Compared with the prior art, the invention has the advantages and positive effects that: the glenoid prosthesis with the locking support is simple to use and operate and novel and reasonable in design. When the bridging locking plate is not used, the existence of the cover plate enables the whole base of the shoulder and pelvis to form a complete curved surface with a certain radian, and the arrangement of a ball head or a polyethylene friction interface is not influenced. If there is the defect behind the shoulder pelvis or before needs to strengthen when stable, remove the cover plate after, will bridge the lockplate and fix with bridging screw with the shoulder pelvis base, make it form the complete part, add locking screw and will bridge lockplate body and fix with the thick sclerotin of scapula lateral margin, increased the stability of entire system, can partially or totally offset the shoulder pelvis base stress that the bone defect in the back of the shoulder pelvis caused uneven, local stress concentration, avoided from this and near, the long-term not hard up of the middle-term, that leads to. The blind-end closed hole with a certain taper in the middle of the shoulder-pelvis base is favorable for forming taper matching fixation with a ball head or a polyethylene friction interface, and micro motion is reduced. The upper surface of the base of the shoulder spittoon is distributed with 4 screw holes at certain intervals, the screw threads are arranged in the screw holes, and the initial stability of the base of the shoulder spittoon can be improved by using locking screws. The lower surface of the base of the shoulder cup and the surface of the tower-shaped keel are provided with roughening treatments such as spraying, which is beneficial to bone ingrowth and improves the overall long-term effect. The appearance of tower-shaped keel is favorable for reducing the loss of scapula pelvis bone, improves the extraction force and enhances the initial stability.

Other features and advantages of the present invention will become more apparent from the detailed description of the embodiments of the present invention when taken in conjunction with the accompanying drawings.

Drawings

Fig. 1 is a first perspective view of a base of a shoulder cup according to an embodiment of the present invention;

fig. 2 is a schematic perspective view of a second glenoid base in an embodiment of the present invention;

FIG. 3 is a schematic diagram of a frontal configuration of a base of a glenoid in an embodiment of the present invention;

FIG. 4 is a schematic perspective view of a cover plate according to an embodiment of the present invention;

FIG. 5 is a first perspective view of a bridging locking plate according to an embodiment of the present invention;

FIG. 6 is a schematic perspective view of a second bridging locking plate according to an embodiment of the present invention;

fig. 7 is a perspective view of a bridge screw according to an embodiment of the present invention.

Detailed Description

The locking support glenoid prosthesis can be used for replacing the conventional glenoid prosthesis and can also be used for cases of combined bone defects, particularly for the repair or fracture cases of bone defects in front of or behind the combined glenoid, the locking support glenoid prosthesis can provide good overall initial stability, reduce micromotion and avoid proximal and middle-term and long-term looseness caused by the micromotion.

The following describes an implementation of the present invention with reference to the following embodiments:

referring to fig. 1-7, the present embodiment proposes a locking support shoulder and pelvis prosthesis made of metal or alloy, divided into left and right sides, and composed of a shoulder and pelvis base 10, a cover plate 20, a bridge locking plate 30 and bridge screws 40.

Referring to fig. 1-3, which are schematic structural views of the base 10, the upper surface and the lower surface of the base 10 have a curvature, and the outer contour of the upper portion 11 is an ellipse. The middle part of the lower surface of the shoulder and pelvis base 10 is connected with a tower-shaped keel 12, the body part of the tower-shaped keel 12 is provided with annular teeth 13 which are gradually narrowed, and the head part is a round and blunt end. The middle part of the upper surface of the shoulder and pelvis base 10 is provided with a blind-end closed hole 14 with a certain taper, and the blind-end closed hole extends to a certain depth inside the tower-shaped keel 12. The lower surface of the shoulder and pelvis base 10 and the surface of the tower-shaped keel 12 are roughened, four screw holes 15 are distributed on the upper surface of the shoulder and pelvis base 10 at intervals, and the screw threads are arranged in the screw holes. The left lower quadrant or the right lower quadrant of the upper surface of the shoulder and pelvis base 10 is close to the edge, a part of the area is absent, the thickness of the absent part 16 is 1/2 of that of the shoulder and pelvis base, and the absent part is provided with 2 screw holes 17 with internal threads.

Referring to fig. 4, which is a schematic structural diagram of the cover plate 20, the thickness of the cover plate 20 is 1/2 of the thickness of the base of the shoulder pelvis, the size of the cover plate is the same as that of the left lower or right lower quadrant indentation 16 of the base of the shoulder pelvis 10, and the surface curvature is consistent with that of the upper surface of the base of the shoulder pelvis 10. The surface of the cover plate 20 is provided with two screw holes 21 with internal threads, the positions of the screw holes correspond to the screw holes at the positions of the shoulder and the base, and the diameters of the screw holes of the cover plate are larger than those of the screw holes at the positions of the shoulder and the base.

Referring to fig. 5 and 6, which are schematic structural views of the bridging locking plate 30, the bridging locking plate 30 is divided into a head part 31 and a body part 32, the two parts are connected at a certain angle, the transition part of the two parts is protruded outwards 33, the head part 31 has the same size as the cover plate 20, 2 screw holes 34 with the same size as the screw holes 21 of the cover plate are also arranged at the same position, the body part 32 is in a narrow and long plate shape, a plurality of screw holes 35 are arranged, and the screw holes are internally provided with threads.

Referring to fig. 7, a structural diagram of the bridging screw 40 is shown, the length of the bridging screw 40 is the same as the thickness of the upper part of the shoulder and pelvis base 10, the diameter of the head part is larger than that of the body part, the diameter of the head part is the same as that of the screw hole 21 of the cover plate, and the diameter of the body part is the same as that of the screw hole 17 at the defect position of the shoulder and pelvis.

In the embodiment, after the glenoid prosthesis with the locking support is implanted into the scapula articular surface to be replaced by using the implantation instrument, good initial stability can be obtained, the thick bone at the base of the glenoid and the rear edge of the scapula can be locked by using the bridging locking plate, and the glenoid prosthesis is particularly suitable for the condition that bone defects exist at the front part or the rear part of the glenoid, can reduce stress concentration and improve the overall long-term effect.

When the bone surface grinding and filing instrument is used, bone surface grinding and filing preparation is carried out on the scapular pelvis, and the cartilage tissue on the surface is removed. Then, a keel is prepared in a proper direction by using a keel preparation chisel, the base 10 of the shoulder cup is driven into the keel, 4 screws are respectively screwed into the screw holes 15 of the base of the shoulder cup, and then the humerus head prosthesis or the polyethylene gasket is placed in the taper hole 14 in the middle of the base of the shoulder cup. If bone defects exist in front of or behind the shoulder pelvis, bone grafting and fixing can be firstly carried out on the bone defects. Selecting a proper left side or right side glenoid base, screwing out a cover plate screw, removing the cover plate 20, pre-shaping the appearance of the bridging locking plate 30 according to the appearance of the side edge of the scapula, covering the defect part of the removed cover plate with the head part 31 of the bridging locking plate 30, and connecting and locking the glenoid base 10 and the bridging locking plate 30 by 2 bridging screws 40. Then, a keel is prepared, the glenoid base 10 is driven into the glenoid keel, the bridging locking plate 30 is attached to the lateral edge of the scapula, and then screws are screwed into the scapula through screw holes of the bridging locking plate for fixation, so that the implantation process is completed.

Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.

Claims

1. A shoulder glenoid prosthesis with locking support is characterized in that: the shoulder glenoid prosthesis with locking support is divided into left and right sides, comprising a shoulder glenoid base, a bridge locking plate, a cover sheet, and a bridge screw, and the above-mentioned structure is matched and used , to form a stable combination system for conventional glenoid prosthesis replacement, or for glenoid prosthesis replacement combined with bone defects.

2 . The shoulder glenoid prosthesis with locking and support according to claim 1 , wherein the upper surface and the lower surface of the shoulder glenoid base both have a certain curvature, and the outer contour is circular or oval, and the shoulder glenoid base is in a circular or elliptical shape. 3 . The middle part of the lower surface is connected with a tower-shaped keel, the body of the tower-shaped keel has progressively narrowed annular teeth, and the head is a blunt end.

3 . The shoulder glenoid prosthesis with locking support according to claim 2 , wherein a blind-end closed hole with a certain taper is formed in the middle of the upper surface of the shoulder glenoid base and extends to a certain depth inside the tower-shaped keel. 4 .

4 . The shoulder glenoid prosthesis with locking and support according to claim 2 , wherein the lower surface of the glenoid base and the surface of the tower-shaped keel are roughened. 5 .

5 . The shoulder glenoid prosthesis with locking and support according to claim 2 , wherein a plurality of screw holes are distributed on the upper surface of the shoulder glenoid base at a certain distance, and the holes are threaded. 6 .

6 . The shoulder glenoid prosthesis with locking and support according to claim 2 , wherein the left lower or right lower quadrant of the upper surface of the shoulder glenoid base is close to the edge, and a part of the area is missing, and the thickness of the missing part is 6 . 1/2 of the glenoid base, with screw holes in the missing part, with internal threads.

7. The shoulder glenoid prosthesis with locking support according to claim 6, wherein the thickness of the cover sheet is 1/2 of that of the glenoid base, the size is the same as that of the lower left or right lower quadrant of the glenoid base, and the surface is the same. The curvature is consistent with the upper surface of the glenoid base; the surface of the cover sheet is provided with screw holes with internal threads, the positions of which correspond to the missing screw holes in the shoulder glenoid base, and the diameter of the cover sheet screw holes is larger than the screw holes at the absent shoulder glenoid base.

8 . The shoulder glenoid prosthesis with locking support according to claim 7 , wherein the bridging locking plate is divided into a head portion and a body portion, and the two portions are connected at a certain angle, and the size of the head portion is the same as that of the cover sheet and is in the same position. 9 . There are also screw holes with the same size as the diameter of the cover sheet screw holes, the body is in the shape of a narrow and long plate, and a plurality of screw holes are opened, and the screw holes are threaded.

9. The shoulder glenoid prosthesis with locking support according to claim 8, wherein the length of the bridge screw is the same as the thickness of the glenoid base, the diameter of the head is equal to the diameter of the screw hole of the cover sheet, and the diameter of the body is equal to the diameter of the glenoid base. Such as screw holes.

10 . The shoulder glenoid prosthesis with locking and support according to claim 1 , wherein the shoulder glenoid prosthesis with locking and support is made of metal or alloy. 11 .