CN214632511U - Three-dimensional femoral stem - Google Patents
Three-dimensional femoral stem Download PDFInfo
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- CN214632511U CN214632511U CN202023105817.5U CN202023105817U CN214632511U CN 214632511 U CN214632511 U CN 214632511U CN 202023105817 U CN202023105817 U CN 202023105817U CN 214632511 U CN214632511 U CN 214632511U
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Abstract
The embodiment of the utility model provides a three-dimensional femoral stem, which is characterized in that an outer cover shell is sleeved outside a stem body through the stem body, and the stem body is fixedly connected with the outer cover shell; the handle body comprises a femoral awl, a femoral neck, a femoral handle shoulder and a femoral handle far end; one end of the shoulder part of the femoral stem is connected with the far end of the femoral stem, and the other end of the shoulder part of the femoral stem is connected with the femoral neck; one end of the femoral neck, which is far away from the shoulder part of the femoral stem, is connected with the femoral awl; the outer housing is a hollow annular structure, the inner side shape of the outer housing is matched with the shape of the shoulder of the femoral stem, and the outer side shape of the outer housing is matched with the shape of the femoral side of the patient. Through the outer housing of three-dimensional printing for the outer housing matches with patient's thighbone side, reduces to cut more high-quality bone volume. Prevent the patient from central dislocation caused by long-term looseness caused by excessive bone loss, improve the survival rate of the prosthesis and improve the matching degree.
Description
Technical Field
The utility model relates to the technical field of medical equipment, concretely relates to three-dimensional femoral stem.
Background
In recent years, along with the acceleration of the aging process of population, hip joint patients are increased continuously, the annual growth rate reaches 20%, artificial hip joint replacement becomes an effective treatment method for a plurality of final stage hip joint patients, and by replacing hip joints, pain, difficulty in movement and various complications of patients can be solved, such as: deep venous thrombosis, falling pneumonia, bedsore and other high-risk diseases, and can recover various functions of hip joints of patients and effectively improve the quality of life. When the hip joint is created, the cartilage is no longer smooth, the synovial capsule becomes inflamed and atrophy, and the joint can no longer function as usual. In the medical field, artificial hip replacement is widely used as a clinical treatment method. The hip joint prosthesis is used for replacing a hip joint of a human body, and the operation process comprises the following steps: inserting the femoral stem prosthesis into the femoral bone marrow cavity and installing a ball head; and the acetabulum and the lining are matched to realize the function of the hip joint.
The femoral stem prosthesis prepared by the traditional process is a standard femoral stem in a mass production mode, and the size and the shape of the femoral stem are the same.
However, the acetabulum of the human body is personalized and diversified in disease types, which results in that most patients achieve the purposes of initial press fit and later bone ingrowth of the traditional outer cup at the cost of removing more excellent bone mass. So that the long-term looseness of many patients caused by excessive bone loss leads to the central dislocation, and the survival rate of the metal outer cup is influenced; and if the patient needs to be renovated due to bone absorption, the standard femoral stem can not meet the matching requirement.
SUMMERY OF THE UTILITY MODEL
In view of the above, the present invention has been made in order to provide a three-dimensional femoral stem that overcomes or at least partially solves the above-mentioned problems.
The application discloses a three-dimensional femoral stem, which comprises a stem body and an outer housing sleeved outside the stem body, wherein the stem body is fixedly connected with the outer housing; the handle body comprises a femoral awl, a femoral neck, a femoral handle shoulder and a femoral handle far end; one end of the shoulder part of the femoral stem is connected with the far end of the femoral stem, and the other end of the shoulder part of the femoral stem is connected with the femoral neck; one end of the femoral neck, which is far away from the shoulder part of the femoral stem, is connected with the femoral awl;
the outer housing is a hollow annular structure, the inner side shape of the outer housing is matched with the shape of the shoulder of the femoral stem, and the outer side shape of the outer housing is matched with the shape of the femoral side of the patient.
Preferably, the fixed connection is a sintered connection and/or a riveted and/or screwed connection, wherein the sintering temperature is greater than 1000 ℃.
Preferably, the porosity of the outer casing is 20% to 85%.
Preferably, the pore size of the pores of the outer casing is 50 μm to 400 μm.
Preferably, the distal end of the femoral stem is tapered.
Preferably, the top end of the shoulder part of the femoral stem is provided with a fixing hole for connecting a femoral stem driver.
Preferably, the outer casing is composed of metal powder.
Preferably, the shank body is made by casting or forging or powder metallurgy.
The application has the following advantages:
in the embodiment of the application, the handle body is fixedly connected with the outer cover shell through the handle body and the outer cover shell sleeved outside the handle body; the handle body comprises a femoral awl, a femoral neck, a femoral handle shoulder and a femoral handle far end; one end of the shoulder part of the femoral stem is connected with the far end of the femoral stem, and the other end of the shoulder part of the femoral stem is connected with the femoral neck; one end of the femoral neck, which is far away from the shoulder part of the femoral stem, is connected with the femoral awl; the outer housing is a hollow annular structure, the inner side shape of the outer housing is matched with the shape of the shoulder of the femoral stem, and the outer side shape of the outer housing is matched with the shape of the femoral side of the patient. Through the outer cover shell of three-dimensional printing, make outer cover shell and patient's thighbone phase-match, reduce to cut more high-quality bone volume. Prevent the patient from central dislocation caused by long-term looseness caused by excessive bone loss, improve the survival rate of the prosthesis and improve the matching degree.
Drawings
In order to more clearly illustrate the technical solutions of the present application, the drawings needed to be used in the description of the present application will be briefly introduced below, and it is apparent that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without inventive labor.
Fig. 1 is a schematic view of a combination structure of an outer shell and a cup body of a three-dimensional femoral stem according to an embodiment of the present application;
FIG. 2 is a schematic view of a stem body of a three-dimensional femoral stem according to an embodiment of the present application;
FIG. 3 is a schematic structural view of an outer shell of a three-dimensional femoral stem according to an embodiment of the present application;
1. a handle body; 2. an outer casing.
Detailed Description
In order to make the aforementioned objects, features and advantages of the present application more comprehensible, the present application is described in further detail with reference to the accompanying drawings and the detailed description. It is to be understood that the embodiments described are only a few embodiments of the present application and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
It should be noted that in any of the embodiments of the present invention, a three-dimensional femoral stem is used to replace a portion of an implant of a patient's femur during hip replacement surgery.
Referring to fig. 1, a schematic structural diagram of a three-dimensional femoral stem provided in an embodiment of the present application is shown, and specifically includes the following structures: the handle comprises a handle body 1 and an outer housing 2 sleeved outside the handle body 1, wherein the handle body 1 is fixedly connected with the outer housing 2; the handle body 1 comprises a femoral awl, a femoral neck, a femoral handle shoulder and a femoral handle far end; one end of the shoulder part of the femoral stem is connected with the far end of the femoral stem, and the other end of the shoulder part of the femoral stem is connected with the femoral neck; one end of the femoral neck, which is far away from the shoulder part of the femoral stem, is connected with the femoral awl; the outer housing 2 is a hollow annular structure, the inner side shape of the outer housing 2 is matched with the shape of the shoulder of the femoral stem, and the outer side shape of the outer housing 2 is matched with the shape of the femoral side of the patient.
In the embodiment of the application, the handle body 1 is fixedly connected with the outer cover shell 2 through the handle body 1 and the outer cover shell 2 sleeved outside the handle body 1; the handle body 1 comprises a femoral awl, a femoral neck, a femoral handle shoulder and a femoral handle far end; one end of the shoulder part of the femoral stem is connected with the far end of the femoral stem, and the other end of the shoulder part of the femoral stem is connected with the femoral neck; one end of the femoral neck, which is far away from the shoulder part of the femoral stem, is connected with the femoral awl; the outer housing 2 is a hollow annular structure, the inner side shape of the outer housing 2 is matched with the shape of the shoulder of the femoral stem, and the outer side shape of the outer housing 2 is matched with the shape of the femoral side of the patient. Through the three-dimensional printed outer housing 2, the outer housing 2 is matched with the femur of a patient, and the cutting of more high-quality bone mass is reduced. Prevent the patient from central dislocation caused by long-term looseness caused by excessive bone loss, improve the survival rate of the prosthesis and improve the matching degree.
Hereinafter, a three-dimensional femoral stem in the present exemplary embodiment will be further described.
Referring to fig. 2, a schematic structural diagram of a stem body 1 of a three-dimensional femoral stem provided in an embodiment of the present application is shown, specifically, the following structure: the handle body 1 comprises a femoral awl, a femoral neck, a femoral handle shoulder and a femoral handle far end; one end of the shoulder part of the femoral stem is connected with the far end of the femoral stem, and the other end of the shoulder part of the femoral stem is connected with the femoral neck; one end of the femoral neck, which is far away from the shoulder part of the femoral stem, is connected with the femoral awl;
in a specific embodiment, the distal end of the femoral stem is tapered, the taper is used for reducing resistance when the femoral stem is implanted, and the taper is beneficial to the entering of the three-dimensional femoral stem during the three-dimensional femoral stem implantation process.
The outer peripheral wall of the distal end of the femoral stem is provided with a longitudinal groove for increasing the contact area with the bone, wherein the longitudinal groove is used for increasing the contact area with the bone, the longitudinal groove increases the contact area of the three-dimensional femoral stem with the bone in a femoral bone marrow cavity, the bone ingrowth is stimulated, the dislocation problem caused by the axial rotation of the three-dimensional femoral stem relative to the femur in the using process can be effectively improved, and the femoral stem is more stable and durable.
The bottom of the distal end of the femoral stem is spherical, so that the resistance of the three-dimensional femoral stem during implantation can be reduced, and the damage to a medullary cavity is reduced; effectively reducing the stress concentration problem at the bottom when the three-dimensional femoral stem is loaded and relieving the transition stimulation to the bone.
In a specific embodiment, the top end of the shoulder part of the femoral stem is provided with a fixing hole for connecting a femoral stem impactor, wherein the fixing hole is matched with the femoral stem prosthesis impactor.
In a particular embodiment, the shank body 1 is made by casting or forging or by powder metallurgy.
It should be noted that casting is a relatively early metal hot working process, and casting is a method in which liquid metal is cast into a casting cavity adapted to the shape of a part, and after cooling and solidification, a part or a blank is obtained. The casting material is mostly metal which is originally solid but is heated to liquid state, such as copper, iron, aluminum, tin, lead, etc., and the material of the casting mold can be sand, metal or even ceramic.
It should be noted that forging is a processing method that a forging press machine is used to apply pressure to a metal blank to generate plastic deformation to obtain a forging with certain mechanical properties, certain shape and certain size, the defects of as-cast porosity and the like generated in the smelting process of metal can be eliminated through forging, the microstructure is optimized, and meanwhile, because a complete metal streamline is preserved, the mechanical properties of a cast object are generally superior to those of a cast of the same material.
Powder metallurgy is a process technology for manufacturing metal materials, composite materials and various types of products by taking metal powder or a mixture of metal powder and nonmetal powder as raw materials and forming and sintering the raw materials.
Referring to fig. 3, a schematic structural diagram of an outer shell 2 of a three-dimensional femoral stem according to an embodiment of the present application is shown, specifically, the following structure: the outer housing 2 is sleeved outside the handle body 1, and the handle body 1 is fixedly connected with the outer housing 2; the outer housing 2 is a hollow annular structure, the inner side shape of the outer housing 2 is matched with the shape of the shoulder of the femoral stem, and the outer side shape of the outer housing 2 is matched with the shape of the femoral side of the patient.
In a particular embodiment, the peripheral wall of the outer casing 2 is provided with grooves for increasing the contact area with the bone.
In a specific embodiment, the fixed connection is a sintered connection and/or a riveted and/or screwed connection, wherein the sintering temperature is greater than 1000 ℃. Thereby achieving the purpose of reducing the phenomena of micrometastasis and corrosion of the handle body 1 and the outer housing 2 and further bone ingrowth.
In a specific embodiment, the porosity of the outer casing 2 is 20% to 85%, and the pore diameter of the pores of the outer casing 2 is 50 μm to 400 μm. The outer casing 2 is made of metal powder.
It should be noted that, according to the actual size of the patient's femur, the outer casing 2 matching with the patient's femur and the inner surface matching with the bottom casing are formed by an additive three-dimensional printing method. Among them, the porosity is preferably 30% to 70%.
It should be noted that the outer shell is formed to fit the patient's femur and the inner surface is formed to fit the stem 1, depending on the actual size of the patient's femur. The pore diameter refers to the pore diameter of a pore formed by the outer casing 2 printed by the three-dimensional printer; the porosity is the volume of the internal pores of the porous solid block material in percentage of the total volume of the material, and represents the pore size of the material, and the porosity of the outer casing shell 2 formed by the three-dimensional printer is referred to in the application.
The embodiments in the present specification are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other.
While preferred embodiments of the present invention have been described, additional variations and modifications of these embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. It is therefore intended that the following claims be interpreted as including the preferred embodiments and all changes and modifications that fall within the scope of the embodiments of the invention.
Finally, it should also be noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or terminal that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or terminal. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in a process, method, article, or terminal that comprises the element.
The three-dimensional femoral stem provided by the present invention is introduced in detail, and the principle and the implementation mode of the present invention are explained by applying specific examples, and the description of the above embodiments is only used to help understanding the method and the core idea of the present invention; meanwhile, for the general technical personnel in the field, according to the idea of the present invention, there are changes in the specific implementation and application scope, to sum up, the content of the present specification should not be understood as the limitation of the present invention.
Claims (8)
1. A three-dimensional femoral stem is used for replacing a partial implant of a femur of a patient in hip replacement surgery, and is characterized by comprising a stem body and an outer cover shell sleeved outside the stem body, wherein the stem body is fixedly connected with the outer cover shell;
the handle body comprises a femoral awl, a femoral neck, a femoral handle shoulder and a femoral handle far end; one end of the shoulder part of the femoral stem is connected with the far end of the femoral stem, and the other end of the shoulder part of the femoral stem is connected with the femoral neck; one end of the femoral neck, which is far away from the shoulder part of the femoral stem, is connected with the femoral awl;
the outer housing is a hollow annular structure, the inner side shape of the outer housing is matched with the shape of the shoulder of the femoral stem, and the outer side shape of the outer housing is matched with the shape of the femoral side of the patient.
2. The three-dimensional femoral stem according to claim 1, wherein said fixed connection is a sintered connection and/or a riveted and/or screwed connection, wherein said sintering temperature is greater than 1000 ℃.
3. The three-dimensional femoral stem according to claim 1, wherein the porosity of the outer shell is 20% to 85%.
4. The three-dimensional femoral stem according to claim 1, wherein the pore size of the outer shell pore space is 50-400 μm.
5. The three-dimensional femoral stem according to claim 1, wherein the distal end of the femoral stem is tapered.
6. The three-dimensional femoral stem according to claim 1, wherein the top end of the shoulder part of the femoral stem is provided with a fixing hole for connecting a femoral stem driver.
7. The three-dimensional femoral stem according to claim 1, wherein the outer shell is comprised of a metal powder.
8. The three-dimensional femoral stem according to claim 1, wherein the stem body is made by casting or forging or powder metallurgy.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202023105817.5U CN214632511U (en) | 2020-12-19 | 2020-12-19 | Three-dimensional femoral stem |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202023105817.5U CN214632511U (en) | 2020-12-19 | 2020-12-19 | Three-dimensional femoral stem |
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| CN214632511U true CN214632511U (en) | 2021-11-09 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112472369A (en) * | 2020-12-19 | 2021-03-12 | 经纬医疗器材制造（深圳）有限公司 | Three-dimensional femoral stem and manufacturing method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112472369A (en) * | 2020-12-19 | 2021-03-12 | 经纬医疗器材制造（深圳）有限公司 | Three-dimensional femoral stem and manufacturing method |
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