CN213722663U - Local replacement system for femoral head - Google Patents
Local replacement system for femoral head Download PDFInfo
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- CN213722663U CN213722663U CN202022724163.8U CN202022724163U CN213722663U CN 213722663 U CN213722663 U CN 213722663U CN 202022724163 U CN202022724163 U CN 202022724163U CN 213722663 U CN213722663 U CN 213722663U
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Abstract
The utility model discloses a local replacement system for femoral head, which comprises a femoral head cartilage replacement part and a femoral head internal filling body, wherein the femoral head internal filling body is provided with a through bolt hole for accommodating a fixing bolt, and the femoral head cartilage replacement part and the femoral head internal filling body are fixed by using a bolt; the covering surface of the femoral head cartilage replacement part is a part of the femoral head. Some examples of the present invention, compared to the conventional hip resurfacing implants with a hemispherical acetabular cup having a horizontal rounded edge, on the one hand allow removal of the femoral head necrotic tissue bearing area, and instead allow replacement with a bearing surface replacement system; on the other hand, the original shape of the femoral head is kept as much as possible, so that the femoral head is more in line with the mechanical conduction of the normal hip joint and more perfect matching of the head and the socket. Thus, partial femoral head replacement can be safely and effectively carried out, the joint function can be maintained, and total hip replacement can be delayed or even avoided.
Description
Technical Field
The utility model relates to an artificial joint prosthesis field, in particular to a local replacement system of femoral head.
Background
Femoral head necrosis (ONFH) is a disabling disease of multifactorial origin, and 94% of early asymptomatic ONFH will progress to the middle or late stage within 5 years without treatment, resulting in a flat femoral head and a severely narrowed joint space, at which time an artificial total hip replacement must be performed. However, for some young patients, the wearing speed of the artificial joint is increased due to the large amount of exercise in daily life, and the service life of the joint is obviously shortened due to the femur reaming in the operation and the long-term wearing of the femoral stem after the operation, so that the hip joint revision needs to be carried out for two or even more times, and the artificial total hip joint replacement brings huge pain and economic burden for the patients. Thus, a safe and effective partial replacement of the femoral head may both maintain joint function and delay or even avoid total hip replacement. The morphology, orientation and position of the acetabular and femoral components of the hip joint are important determinants of their function.
The success of a natural hip is based on the design parameters of these components, which are capable of avoiding bony prominences and soft tissue impingement over the normal range of motion. The natural acetabulum is not completely hemispherical, and its rim is not simply a circle but a 3D shape with a series of elevations and depressions. Similarly on the femoral side, the junction between the head and neck is not perfectly circular. Modern hip resurfacing implant designs are based on hemispherical acetabular cups with horizontal rounded edges. On the femoral side, variable-ratio spheroids have been adopted by different implant manufacturers. Acetabular cups that overhang the rim of the acetabulum have been shown to be associated with impingement, premature loosening, and accelerated wear.
The design of a femoral head replacement system which is more beneficial to maintaining joint functions and can delay or even avoid total hip replacement has very practical significance.
SUMMERY OF THE UTILITY MODEL
The present invention is directed to overcoming at least one of the deficiencies of the prior art and providing a system for local replacement of a femoral head.
The utility model adopts the technical proposal that:
the local femoral head replacement system comprises a femoral head cartilage replacement part and a femoral head internal filling body, wherein the femoral head internal filling body is provided with a through bolt hole for accommodating a fixing bolt, and the femoral head cartilage replacement part and the femoral head internal filling body are fixed by using a bolt;
the covering surface of the femoral head cartilage replacement part is as follows:
the femoral head vertex of the hip correction X-ray is taken as a datum point, a horizontal plane passing through the datum point is taken as a datum plane, and an area which surrounds the datum point, is 0-30 degrees inside, 0-30 degrees outside, 0-30 degrees in front and 0-30 degrees in back and is in contact with the datum plane is matched with the surface of the normal femoral head cartilage.
In some examples, the femoral head internal filling is placed in a direction consistent with a femoral pressure trabecula.
In some examples, the bolt holes are oriented in line with the femoral tensioning trabeculae.
In some examples, the femoral head internal filling body is a three-dimensional porous mesh structure.
In some examples, the femoral head internal filling body has a plurality of interconnected tunnels on the surface and inside.
In some examples, the femoral head internal filling body is further provided with a bone grafting hole.
In some examples, the inner and outer surfaces of the femoral head internal filling body are provided with a coating that facilitates bone growth.
In some examples, the coating is a hydroxyapatite coating.
In some examples, the femoral head cartilage replacement is made of a medical grade metal with a modulus of elasticity approaching that of cartilage.
In some examples, the femoral head internal filling body is made of a medical metal or bioceramic.
The utility model has the advantages that:
some examples of the present invention, compared to the conventional hip resurfacing implants with a hemispherical acetabular cup having a horizontal rounded edge, on the one hand allow removal of the femoral head necrotic tissue bearing area, and instead allow replacement with a bearing surface replacement system; on the other hand, the original shape of the femoral head is kept as much as possible, so that the femoral head is more in line with the mechanical conduction of the normal hip joint and more perfect matching of the head and the socket. Thus, partial femoral head replacement can be safely and effectively carried out, the joint function can be maintained, and total hip replacement can be delayed or even avoided.
In some examples of the utility model, the placing direction of the filling body in the femoral head is consistent with that of the femoral pressure trabecula, which is beneficial to the growth and healing of the bone, and simultaneously, the filling body is similar to the physiological structure of the original bone and has better mechanical property,
some examples of the utility model, the direction of bolt hole is unanimous with thighbone tension bone trabecula, and is similar with the physiology structure of primary bone, can fix the obturator better simultaneously, easily obtains after the fusion more being close the structure with primary skeleton texture.
The utility model discloses a some examples, the structure is firm, convenient operation, and simple structure, easily processing.
Some examples of the utility model, the three-dimensional porous net structure of the internal filling body of the femoral head, are beneficial to the infiltration and growth of external bone tissues. Particularly, the broken bone particles or bone mud implanted into the bone grafting hole in the operation can be integrated with the external bone tissue for fusion and growth, thereby achieving the effect of effectively preventing the local replacement system of the femoral head from loosening for a long time.
Drawings
FIG. 1 is a schematic structural view of some examples of the present invention;
fig. 2 is a schematic view of a partial replacement femoral head according to some embodiments of the present invention.
Detailed Description
This section will describe in detail the embodiments of the present invention, preferred embodiments of the present invention are shown in the attached drawings, which are used to supplement the description of the text part of the specification with figures, so that one can intuitively and vividly understand each technical feature and the whole technical solution of the present invention, but they cannot be understood as the limitation of the protection scope of the present invention.
In the description of the present invention, it should be understood that the orientation or positional relationship indicated with respect to the orientation description, such as up, down, front, rear, left, right, etc., is based on the orientation or positional relationship shown in the drawings, and is only for convenience of description and simplification of description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention.
In the description of the present invention, a plurality of means are one or more, a plurality of means are two or more, and the terms greater than, less than, exceeding, etc. are understood as not including the number, and the terms greater than, less than, within, etc. are understood as including the number. If the first and second are described for the purpose of distinguishing technical features, they are not to be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated or implicitly indicating the precedence of the technical features indicated.
In the description of the present invention, unless there is an explicit limitation, the words such as setting, installation, connection, etc. should be understood in a broad sense, and those skilled in the art can reasonably determine the specific meanings of the above words in combination with the specific contents of the technical solution.
Referring to fig. 1 and 2, the partial femoral head replacement system includes a femoral head cartilage replacement 1 and a femoral head internal filling body 2, wherein the femoral head internal filling body 2 has a through bolt hole for receiving a fixing bolt 3, and the femoral head cartilage replacement 1 and the femoral head internal filling body 2 are fixed by using the bolt 3;
the covering surface of the femoral head cartilage replacement 1 is as follows:
the femoral head vertex of the hip correction X-ray is taken as a datum point, a horizontal plane passing through the datum point is taken as a datum plane, and an area which surrounds the datum point, is 0-30 degrees inside, 0-30 degrees outside, 0-30 degrees in front and 0-30 degrees in back and is in contact with the datum plane is matched with the surface of the normal femoral head cartilage.
In some examples, the femoral head internal filling is placed in a direction consistent with a femoral pressure trabecula.
In some examples, the bolt holes are oriented in line with the femoral tensioning trabeculae.
In some examples, the femoral head internal filling body is a three-dimensional porous mesh structure.
In some examples, the femoral head internal filling body has a plurality of interconnected tunnels on the surface and inside.
In some examples, the femoral head internal filling body is further provided with a bone grafting hole.
In some examples, the inner and outer surfaces of the femoral head internal filling body are provided with a coating that facilitates bone growth.
In some examples, the coating is a hydroxyapatite coating.
In some examples, the femoral head cartilage replacement is made of a medical grade metal with a modulus of elasticity approaching that of cartilage.
In some examples, the femoral head internal filling body is made of a medical metal or bioceramic.
Some examples of the present invention, compared to the conventional hip resurfacing implants with a hemispherical acetabular cup having a horizontal rounded edge, on the one hand allow removal of the femoral head necrotic tissue bearing area, and instead allow replacement with a bearing surface replacement system; on the other hand, the original shape of the femoral head is kept as much as possible, so that the femoral head is more in line with the mechanical conduction of the normal hip joint and more perfect matching of the head and the socket, as shown in figure 2. Thus, partial femoral head replacement can be safely and effectively carried out, the joint function can be maintained, and total hip replacement can be delayed or even avoided.
In some examples of the utility model, the placing direction of the filling body in the femoral head is consistent with that of the femoral pressure trabecula, which is beneficial to the growth and healing of the bone, and simultaneously, the filling body is similar to the physiological structure of the original bone and has better mechanical property,
some examples of the utility model, the direction of bolt hole is unanimous with thighbone tension bone trabecula, and is similar with the physiology structure of primary bone, can fix the obturator better simultaneously, easily obtains after the fusion more being close the structure with primary skeleton texture.
The utility model discloses a some examples, the structure is firm, convenient operation, and simple structure, easily processing.
Some examples of the utility model, the three-dimensional porous net structure of the internal filling body of the femoral head, are beneficial to the infiltration and growth of external bone tissues. Particularly, the broken bone particles or bone mud implanted into the bone grafting hole in the operation can be integrated with the external bone tissue for fusion and growth, thereby achieving the effect of effectively preventing the local replacement system of the femoral head from loosening for a long time.
Claims (10)
1. Partial replacement system of femoral head, its characterized in that: the femoral head cartilage replacement part and the femoral head internal filling body are fixed by bolts;
the covering surface of the femoral head cartilage replacement part is as follows:
the femoral head vertex of the hip correction X-ray is taken as a datum point, a horizontal plane passing through the datum point is taken as a datum plane, and an area which surrounds the datum point, rotates by 0-30 degrees at the inner side, 0-30 degrees at the outer side, 0-60 degrees at the front side and 0-60 degrees at the rear side, is in contact with the datum plane and is matched with the surface of a normal femoral head cartilage.
2. The partial femoral head replacement system of claim 1, wherein: the placing direction of the filling body in the femoral head is consistent with that of the femoral pressure trabecula.
3. The partial femoral head replacement system of claim 1, wherein: the direction of the bolt hole is consistent with that of the femoral tension trabecula.
4. The partial femoral head replacement system of claim 1, wherein: the femoral head internal filling body is of a three-dimensional porous net body structure.
5. The partial femoral head replacement system of claim 4, wherein: the surface and the interior of the femoral head internal filling body are provided with a plurality of mutually communicated pore canals.
6. The partial femoral head replacement system of claim 1, wherein: the femoral head internal filling body is also provided with a bone grafting hole.
7. The partial femoral head replacement system of claim 1, wherein: the inner surface and the outer surface of the femoral head internal filling body are provided with coatings beneficial to bone growth.
8. The partial femoral head replacement system of claim 7, wherein: the coating is a hydroxyapatite coating.
9. The partial femoral head replacement system of claim 1, wherein: the femoral head cartilage replacement is made of medical metal with the elastic modulus close to that of cartilage.
10. The partial femoral head replacement system of claim 1, wherein: the femoral head internal filling body is made of medical metal or biological ceramic.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022724163.8U CN213722663U (en) | 2020-11-23 | 2020-11-23 | Local replacement system for femoral head |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022724163.8U CN213722663U (en) | 2020-11-23 | 2020-11-23 | Local replacement system for femoral head |
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| CN213722663U true CN213722663U (en) | 2021-07-20 |
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| CN202022724163.8U Active CN213722663U (en) | 2020-11-23 | 2020-11-23 | Local replacement system for femoral head |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116602797A (en) * | 2023-07-21 | 2023-08-18 | 上海大博医疗科技有限公司 | Conical self-locking partial femoral head replacement device capable of customizing reserved femoral head in personalized manner |
-
2020
- 2020-11-23 CN CN202022724163.8U patent/CN213722663U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116602797A (en) * | 2023-07-21 | 2023-08-18 | 上海大博医疗科技有限公司 | Conical self-locking partial femoral head replacement device capable of customizing reserved femoral head in personalized manner |
| CN116602797B (en) * | 2023-07-21 | 2023-11-14 | 上海大博医疗科技有限公司 | Conical self-locking partial femoral head replacement device capable of customizing reserved femoral head in personalized manner |
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Address after: No.263, Longxi Avenue, Liwan District, Guangzhou, Guangdong 510378 Patentee after: The Third Affiliated Hospital of Guangzhou University of Chinese Medicine (The Third Clinical Medical College of Guangzhou University of Chinese Medicine The Affiliated Orthopedic Hospital of Guangzhou University of Chinese Medicine Guangdong Orthopedic Institute of Chinese Medicine) Address before: No.263, Longxi Avenue, Liwan District, Guangzhou, Guangdong 510378 Patentee before: The Third Affiliated Hospital of Guangzhou University of Chinese Medicine(The Third Clinical Medical College of Guangzhou University of Chinese Medicine The Affiliated Orthopedic Hospital of Guangzhou University of Chinese Medicine Orthopedic Institute of Guangzhou University of Chinese Medicine) |
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| TR01 | Transfer of patent right | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20220307 Address after: 213100 floor 1B1, No. 8, Xihu Road, Wujin high tech Industrial Development Zone, Changzhou City, Jiangsu Province Patentee after: Opameison (Jiangsu) Medical Technology Co.,Ltd. Address before: No.263, Longxi Avenue, Liwan District, Guangzhou, Guangdong 510378 Patentee before: The Third Affiliated Hospital of Guangzhou University of Chinese Medicine (The Third Clinical Medical College of Guangzhou University of Chinese Medicine The Affiliated Orthopedic Hospital of Guangzhou University of Chinese Medicine Guangdong Orthopedic Institute of Chinese Medicine) |