CN219000737U

CN219000737U - Embedded biological knee joint patella prosthesis

Info

Publication number: CN219000737U
Application number: CN202223099004.9U
Authority: CN
Inventors: 孙永强; 潘建康
Original assignee: Individual
Current assignee: Individual
Priority date: 2022-11-22
Filing date: 2022-11-22
Publication date: 2023-05-12
Anticipated expiration: 2032-11-22

Abstract

The utility model discloses an embedded biological knee joint patella prosthesis, which comprises a prosthesis body, a mounting groove, a connecting plate and a connecting column, wherein the mounting groove is arranged on the upper surface of the prosthesis body, the opening of the mounting groove is upward, the connecting plate is fixedly connected with the upper surface of the mounting groove, the connecting column is fixedly connected with the upper surface of the connecting plate, the connecting column is mutually perpendicular to the connecting plate, the diameter of the connecting plate is smaller than that of the upper surface of the prosthesis body, the connecting plate is arranged in a patella after osteotomy, and the contact area of the prosthesis body and the patella after osteotomy is increased, so that the stability of the prosthesis body and the patella is better, and the occurrence of later more complications is avoided.

Description

Embedded biological knee joint patella prosthesis

Technical Field

The utility model relates to the technical field of joint prostheses, in particular to an embedded biological knee joint patella prosthesis.

Background

Knee replacement is an effective treatment for end-stage knee arthritis, rheumatoid arthritis. In 2019, the knee joint replacement of China almost reaches 30 ten thousand times.

Knee joint is a three compartment joint and patellofemoral arthritis is one of the important causes of pain in the anterior knee. Although there is currently no consensus on whether patella replacement is to be performed, 1/4 of the clinicians choose to perform patella replacement.

Most current patella prostheses are cement prostheses, which suffer from disadvantages including: the biological patella prosthesis has long operation time, three-body abrasion caused by using bone cement, bone cement disease and the like, and can reduce the operation time while avoiding the problems due to the development of metal materials. However, for patients with severe rheumatoid disease and severe osteoporosis, the insufficient initial stability of the existing biological prosthesis can cause serious complications, for example, the chinese patent of application No. 2012101637944 discloses an artificial knee prosthesis, which comprises a patella prosthesis and a femoral prosthesis, wherein the patella prosthesis has metal support, and comprises a top, a bottom and a patella connecting post, and the patella prosthesis has a small contact area when being connected with the patella to be cut, the patella prosthesis has insufficient stability with the patella of different cuts, and more later complications.

Therefore, the utility model provides an embedded biological knee joint patella prosthesis with large contact area with the patella after osteotomy and good stability, which is a problem of known research.

Disclosure of Invention

The utility model aims to provide an embedded biological knee joint patella prosthesis which has large contact area with the patella after osteotomy and good stability.

The purpose of the utility model is realized in the following way:

the utility model provides an embedded biological knee joint patella prosthesis, includes the prosthesis body, still includes the mounting groove that is located the upper surface of prosthesis body and opening upwards, with mounting groove upper surface fixed connection's connecting plate, with connecting plate upper surface fixed connection's spliced pole, spliced pole and connecting plate mutually perpendicular, the diameter of connecting plate is less than the diameter of prosthesis body upper surface.

The connecting plate is a circular plate, the thickness of the connecting plate is 3-5mm, and the diameter of the connecting plate is 28-30mm.

The outer surface of the connecting plate and the outer surface of the connecting column are provided with a plurality of micropores, the micropores penetrate through the connecting column and the connecting plate, and the porosity of the micropores is 100-400 mu m.

The lower surface of connecting plate is equipped with a plurality of archs, the arch is the hemisphere, protruding top with distance between the connecting plate lower surface is 0.3~0.5mm, and distance between two adjacent archs is 0.5~0.8mm.

The lower surface of the prosthesis body is dome-shaped, the thickness of the prosthesis body is 7-10 mm, and the diameter of the prosthesis body is 27-34mm.

The connecting columns are at least three, the at least three connecting columns are uniformly distributed along the circumference of the edge of the connecting plate, the connecting columns are cylinders, the length of each connecting column is 6-8mm, and the diameter of each connecting column is 3-4mm.

The prosthesis body is made of ultra-high molecular polyethylene, and the connecting plates and the connecting columns are made of one of stainless steel or titanium alloy.

The prosthesis body is made of ultra-high molecular polyethylene, the connecting plates and the connecting columns are manufactured in a 3D printing mode, and the connecting plates and the connecting columns are made of metal materials.

The beneficial effects of the utility model are as follows: the connecting plate is positioned in the patella after osteotomy, so that the contact area between the prosthesis body and the patella after osteotomy is increased, the stability of the prosthesis body and the patella is better, more complications in the later period are avoided, the contact area between the connecting plate and the prosthesis body is increased due to the protruding arrangement, and the hot melting effect of the connecting plate and the prosthesis body is good and the fixing is firm.

Drawings

FIG. 1 is a schematic diagram of the structure of the present utility model;

FIG. 2 is a top view of FIG. 1;

FIG. 3 is a perspective view of the present utility model;

FIG. 4 is a cross-sectional view in the direction A-A;

FIG. 5 is an enlarged schematic view of part B;

FIG. 6 is a schematic view of the patellar connection of the present utility model after osteotomy;

in the figure: the prosthesis comprises a prosthesis body 1, a connecting plate 2, a connecting column 3, a bulge 4, a patella 5 after osteotomy, articular cartilage 6 and micropores 7.

Detailed Description

The utility model is further described below with reference to the drawings and examples.

Example 1:

as shown in fig. 1 to 3, an embedded biological knee joint patella prosthesis comprises a prosthesis body 1, and further comprises an installation groove, a connecting plate 2 and a connecting column 3, wherein the installation groove is arranged on the upper surface of the prosthesis body 1 and is provided with an upward opening, the connecting plate 2 is fixedly connected with the upper surface of the installation groove, the connecting column 3 is fixedly connected with the upper surface of the connecting plate 2, the connecting column 3 is mutually perpendicular to the connecting plate 2, the connecting column 3 is conveniently inserted into a patella 5 after osteotomy, the connecting plate 2 is also positioned in the patella 5 after osteotomy, the prosthesis body 1 is made of ultrahigh molecular weight polyethylene, the connecting plate 2 and the connecting column 3 are made of titanium alloy, and the connecting plate and the connecting column are made of 3D in a printing mode, and the connecting plate 3 is connected with the prosthesis body 1 through hot melting, so that the connecting plate 3 and the prosthesis body 1 are fused into a whole.

The diameter of connecting plate 2 is less than the diameter of prosthetic body 1 upper surface, and the connecting plate 2 of being convenient for is located the patella after being cut the bone 5, connecting plate 2 is the circular plate, the thickness of connecting plate 2 is 3mm, and the diameter of connecting plate 2 is 28mm, and connecting plate 2 and spliced pole 3 all are located the patella after being cut the bone 5, have increased prosthetic body and the area of contact of the patella after cutting the bone to make prosthetic body 1 and the stability of patella better, avoid the appearance of the more complication of later stage.

The outer surface of the connecting plate 2 and the outer surface of the connecting column 3 are provided with a plurality of micropores, the micropores penetrate through the connecting column 3 and the connecting plate 2, the porosity of the micropores is 100 mu m, and the micropores are arranged so that bones can grow into the micropores conveniently, and the prosthesis and the bones are fused into a whole.

As shown in fig. 4 and 5, the lower surface of the connecting plate 2 is provided with a plurality of protrusions 4, the protrusions 4 are hemispherical, the distance between the top of each protrusion and the lower surface of the connecting plate 2 is 0.3mm, the distance between two adjacent protrusions is 0.5mm, and the contact area between the connecting plate 2 and the inner surface of the mounting groove is increased by the protrusions 4, so that the connection firmness of the connecting plate 2 and the prosthesis body 1 is increased.

The lower surface of the prosthesis body 1 is dome-shaped and can be matched with articular cartilage 6, the thickness of the prosthesis body 1 is 7mm, the diameter of the prosthesis body 1 is 27mm, and the size of the prosthesis body 1 is consistent with the size of the patella of the cut part, so that the patient can use the prosthesis comfortably.

The connecting columns 3 are arranged in three, the three connecting columns 3 are uniformly distributed along the circumference of the edge of the connecting plate 2, the connecting columns 3 are cylinders, the length of each connecting column 3 is 6mm, the diameter of each connecting column 3 is 3mm, the connecting columns 3 can conveniently penetrate into the patella 5 after osteotomy, and the prosthesis body 1 and the patella 5 after osteotomy are stably connected.

When in use, as shown in fig. 6, firstly, the surface of the patella 5 of the osteotomy is provided with a placing groove for placing the connecting plate 2 and a connecting hole for placing the connecting column 3, the diameter of the connecting plate 2 is equal to that of the placing groove, the depth of the placing groove is smaller than the thickness of the connecting plate 2 by 1mm, the depth of the connecting hole is equal to that of the connecting column 3, the diameter of the connecting hole is smaller than that of the connecting column by 1mm, then the connecting column 3 is inserted into the connecting hole, the connecting plate 2 is placed in the placing groove, the prosthesis is pressed into the patella by using a tool to realize the press fit of 1mm, at the moment, the connecting plate 2 and the connecting column 3 are both positioned in the patella 5 of the osteotomy, the stability of the prosthesis body 1 and the patella 5 of the osteotomy is increased, and newly grown bones are subjected to the inside micropores on the connecting plate 2 and the connecting column 3 during the later bone growth, so that the connecting column 3 and the connecting plate 2 are integrated with the bones, and the comfort of patients is increased.

Example 2:

The diameter of the connecting plate 2 is smaller than the diameter of the upper surface of the prosthesis body 1. The connecting plate 2 is a circular plate, the thickness of the connecting plate 2 is 3-5mm, the diameter of the connecting plate 2 is 30mm, the connecting plate 2 and the connecting post 3 are both positioned in the patella 5 after osteotomy, and the contact area of the prosthesis body and the patella after osteotomy is increased, so that the stability of the prosthesis body 1 and the patella is better, and the occurrence of more complications in later period is avoided.

The outer surface of the connecting plate 2 and the outer surface of the connecting column 3 are provided with a plurality of micropores, the micropores penetrate through the connecting column 3 and the connecting plate 2, the porosity of the micropores is 400 mu m, and the micropores are arranged so that bones can grow into the micropores conveniently, and the prosthesis and the bones are fused into a whole.

As shown in fig. 4 and 5, the lower surface of the connecting plate 2 is provided with a plurality of protrusions 4, the protrusions 4 are hemispherical, the distance between the top of each protrusion and the lower surface of the connecting plate 2 is 0.5mm, the distance between two adjacent protrusions is 0.8mm, and the contact area between the connecting plate 2 and the inner surface of the mounting groove is increased by the protrusions 4, so that the connection firmness of the connecting plate 2 and the prosthesis body 1 is increased.

The lower surface of the prosthesis body 1 is dome-shaped and can be matched with articular cartilage 6, the thickness of the prosthesis body 1 is 10mm, the diameter of the prosthesis body 1 is 34mm, and the size of the prosthesis body 1 is consistent with the size of the patella of the cut part, so that the patient can use the prosthesis comfortably.

The connecting columns 3 are arranged in three, the three connecting columns 3 are uniformly distributed along the circumference of the edge of the connecting plate 2, the connecting columns 3 are cylinders, the length of each connecting column 3 is 8mm, the diameter of each connecting column 3 is 4mm, the connecting columns 3 can conveniently penetrate into the patella 5 after osteotomy, and the prosthesis body 1 and the patella 5 after osteotomy are stably connected.

The connecting plate is positioned in the patella after osteotomy, so that the contact area between the prosthesis body and the patella after osteotomy is increased, the stability of the prosthesis body and the patella is better, more complications in the later period are avoided, the contact area between the connecting plate and the prosthesis body is increased due to the protruding arrangement, and the hot melting effect of the connecting plate and the prosthesis body is good and the fixing is firm.

Claims

1. An embedded biological knee joint patella prosthesis, includes the prosthesis body, its characterized in that: the implant prosthesis comprises a prosthesis body, a mounting groove, a connecting plate and a connecting column, wherein the mounting groove is arranged on the upper surface of the prosthesis body, the opening of the mounting groove is upward, the connecting plate is fixedly connected with the upper surface of the mounting groove, the connecting column is fixedly connected with the upper surface of the connecting plate, the connecting column is mutually perpendicular to the connecting plate, and the diameter of the connecting plate is smaller than that of the upper surface of the prosthesis body.

2. The embedded biological knee patella prosthesis of claim 1, wherein: the connecting plate is a circular plate, the thickness of the connecting plate is 3-5mm, and the diameter of the connecting plate is 28-30mm.

3. The embedded biological knee patella prosthesis of claim 1, wherein: the outer surface of the connecting plate and the outer surface of the connecting column are provided with a plurality of micropores, the micropores penetrate through the connecting column and the connecting plate, and the porosity of the micropores is 100-400 mu m.

4. The embedded biological knee patella prosthesis of claim 1, wherein: the lower surface of connecting plate is equipped with a plurality of archs, the arch is the hemisphere, protruding top with distance between the connecting plate lower surface is 0.3~0.5mm, and distance between two adjacent archs is 0.5~0.8mm.

5. The embedded biological knee patella prosthesis of claim 1, wherein: the lower surface of the prosthesis body is dome-shaped, the thickness of the prosthesis body is 7-10 mm, and the diameter of the prosthesis body is 27-34mm.

6. The embedded biological knee patella prosthesis of claim 1, wherein: the connecting columns are at least three, the at least three connecting columns are uniformly distributed along the circumference of the edge of the connecting plate, the connecting columns are cylinders, the length of each connecting column is 6-8mm, and the diameter of each connecting column is 3-4mm.

7. The embedded biological knee patella prosthesis of claim 1, wherein: the prosthesis body is made of ultra-high molecular polyethylene, the connecting plates and the connecting columns are manufactured in a 3D printing mode, and the connecting plates and the connecting columns are made of metal materials.