CN210077954U - Individualized femoral stem prosthesis easy to remove and repair - Google Patents
Individualized femoral stem prosthesis easy to remove and repair Download PDFInfo
- Publication number
- CN210077954U CN210077954U CN201820343899.0U CN201820343899U CN210077954U CN 210077954 U CN210077954 U CN 210077954U CN 201820343899 U CN201820343899 U CN 201820343899U CN 210077954 U CN210077954 U CN 210077954U
- Authority
- CN
- China
- Prior art keywords
- femoral stem
- prosthesis
- sleeve
- femoral
- stem
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Abstract
The utility model discloses an individualized femoral stem prosthesis of easy excision renovation, the false body is including individualized NiTi alloy porous biological femoral stem cover and individualized femoral stem main part that have memory effect, for solving the fixed difficult problem of renovating of traditional bone cement, the utility model discloses a biological porous femoral stem cover and its characteristics include that the stem cover accords with the pulp cavity structure for, but slightly be less than the pulp cavity structure, the stem cover adopts the NiTi alloy 3D printing of memory effect to take shape and through the memory training of later stage, the stem cover is a nature expansion type porous structure in the form, and according to the atress analysis, has certain change at the thighbone inside and outside porosity; the memory effect of the handle sleeve takes the temperature lower than the body temperature by 10-20 ℃ as a phase transition temperature point, the handle sleeve belongs to a contraction state when the temperature is lower than the phase transition temperature point, and the handle sleeve is an expansion state when the temperature is higher than the phase transition temperature point; the prosthesis has simple structural design, is highly attached to a marrow cavity structure, has good biocompatibility, and can prevent the problems of subsidence, looseness, torsion and the like of the femoral stem prosthesis.
Description
Technical Field
The utility model belongs to the technical field of the artificial joint in medical bone replacement field, a individualized femoral stem prosthesis of easy excision renovation is related to.
Background
The 4D printing technology is to add a "time" element to the concept of conventional 3D printing, and the printed object can be self-adjusted in shape over time. The technology can directly and rapidly form the material without a printing machine, and is called revolutionary technology. The 4D printing technology can be applied to furniture, bicycles, automobiles and even the medical field.
The NiTi alloy has shape memory effect and super-elastic behavior, and is widely applied to the aspects of biological medicine, aerospace, intelligent robots and the like. The method for selectively melting and 3D printing the NiTi alloy hip joint femoral stem prosthesis with the memory effect by laser forms a novel 4D printing method for the hip joint prosthesis.
The existing femoral stem assembly mostly adopts a standardized prosthesis, a medullary cavity file is expanded into a medullary cavity in advance during installation, and the medullary cavity file is replaced from a small size to a large size one by one, so that the prosthesis stem can be completely filled with the medullary cavity. The axial line of the prosthesis handle is coincident with the axial line of the femoral shaft, the prosthesis keeps an anteversion angle of 5-10 degrees, the center of the prosthesis head is at the same level with the vertex of the large tuberosity, the lower end of the prosthesis neck is slightly higher than the osteotomy surface by 1mm, and the standard prosthesis is not matched with bone marrow after being implanted, is difficult to fix for a long time and is easy to loosen. In addition, after the standardized prosthesis is fixed by adopting bone cement, the bone cement is connected with the personalized femoral stem prosthesis and the bone, and the bone cement is difficult to remove and separate after being cured and difficult to repair.
When the femoral stem prosthesis is implanted into a human body, the femoral stem prosthesis is difficult to match with a femoral osteotomy surface, and the femoral stem prosthesis completely matched with a medullary cavity can partially interfere with the medullary cavity and is difficult to be installed. In addition, when the load of the femur is unbalanced and the shearing and torsion stresses generated by the interface exceed the bearing range, the femoral stem prosthesis is easy to loosen, twist and sink when the two sides of the interface are slightly moved relatively.
SUMMERY OF THE UTILITY MODEL
The utility model discloses a main aim at overcomes prior art's shortcoming and not enough, provides an individual femoral stem false body of easy excision renovation, and this false body structural design is simple, with the high laminating of marrow cavity structure, and biocompatibility is good, and can prevent that femoral stem false body from sinking, not hard up and twist reverse the scheduling problem. In order to achieve the above purpose, the utility model adopts the following technical scheme:
the utility model relates to an individual femoral stem prosthesis easy to remove and repair, which comprises an individual NiTi alloy porous biological femoral stem sleeve with memory effect and an individual femoral stem main body, wherein the shape of the femoral stem sleeve is matched with the medullary cavity structure, the femoral stem sleeve is smaller than the medullary cavity structure, and the stem sleeve is a natural expansion type porous structure;
the femoral stem body consists of a head part, a neck part and a marrow-imitating cavity, wherein the marrow-imitating cavity in the femoral stem body is arranged in the femoral stem sleeve; the femoral stem sleeve is formed by a NiTi alloy porous structure with a memory effect, and utilizes the permanent super elasticity of the NiTi alloy to tightly hold, clamp and fix with the medullary cavity simulating structure in the femoral stem main body on the one hand, and contact and fix with the medullary cavity on the other hand and provide continuous stress by utilizing the super elasticity of the NiTi alloy.
As a preferred technical scheme, the memory effect of the handle sleeve takes the temperature lower than the body temperature by 10-20 ℃ as a phase change temperature point, the handle sleeve belongs to a contraction state when the temperature is lower than the phase change temperature point, and the handle sleeve is an expansion state when the temperature is higher than the phase change temperature point; after the handle sleeve is implanted into a human body, the handle sleeve naturally expands under the influence of the temperature of the human body, one surface of the expanded handle sleeve is naturally matched and contacted with bones and has certain pretightening force, and the other surface of the expanded handle sleeve is naturally clasped with the personalized femoral handle main body to form a firm combination body.
As a preferable technical scheme, when the body is controlled at a cold temperature, the femoral stem is used for heat conduction, and the metal cold conduction is relatively fast, so that the temperature of the side of the stem sleeve in contact with the femoral stem is reduced, the temperature is firstly below a phase-change temperature point to generate phase change, the stem sleeve is contracted, the personalized femoral stem is separated from the stem sleeve, and the femoral stem body can be removed and replaced.
As the preferred technical scheme, when the femoral sleeve needs to be removed and renovated synchronously, the individualized femoral stem main body continues to be cooled continuously after being removed, the stem sleeve is shrunk integrally, and the contact surface of the stem sleeve and the bone has continuous stress shrinkage and is slowly separated from the bone without influencing other bone structures in the femoral medullary cavity.
As a preferable technical solution, the size of the porous structure after expansion is smaller than or equal to the bone ingrowth size.
As a preferable technical scheme, the porosity of the natural expansion type porous structure on the inner side and the outer side of the femur changes along with the change of the stress state under the condition that the proximal end of the femur is stressed.
As a preferred technical scheme, the handle sleeve is formed by 3D printing and shaping NiTi alloy with a memory effect and performing later memory training.
Compared with the prior art, the utility model, following advantage and beneficial effect have:
1. the utility model relates to an individualized femoral stem prosthesis of easy excision renovation adopts the NiTi alloy multilayer gradient that has two-way memory effect to realize individualized femoral stem prosthesis's replacement and renovation, has not only satisfied the requirement that matches completely with the marrow cavity in the shape, has solved moreover when femoral stem prosthesis implants the human body and has taken place the problem of interfering with the marrow cavity.
2. The utility model discloses will have the individualized NiTi alloy porous biological nature femoral stem cover of memory effect and individualized femoral stem main part combination implantation human body, greatly simplified the step that the femoral stem false body implanted the human body for the femoral stem false body is easily implanted. When the stem sleeve and the personalized femoral stem prosthesis need replacement and revision, the expansion and contraction of the stem sleeve are changed only by controlling the temperature to reach the phase change temperature point, and other structures of the marrow cavity are not affected. After the artificial femoral stem sleeve is implanted into a human body, the individualized NiTi alloy porous biological femoral stem sleeve with the memory effect is firmly and tightly contacted with the femoral stem main body, the looseness, the sinking, the torsion and the like of the prosthesis can be prevented, and the stability and the anti-rotation capability of the individualized femoral stem prosthesis are improved.
Drawings
Fig. 1(a) is a three-dimensional reconstruction of a personalized femoral medullary cavity;
FIG. 1(b) shows the shape of the femoral head after osteotomy;
fig. 2(a) is a two-way effect personalized gradient porous femoral sleeve 3D printed and trained with subsequent memory;
fig. 2(b) is a personalized femoral stem body;
fig. 2(c) shows the personalized femoral stem sleeve mated with the femoral stem body;
fig. 3 is a schematic view of the replacement and revision of the personalized femoral stem sleeve and the femoral stem body;
FIG. 4 illustrates a method of designing and manufacturing a personalized femoral stem prosthesis that is easily removed and revised;
fig. 5 is an embodiment of a personalized femoral stem prosthesis that is easily removed and revised.
Detailed Description
The present invention will be described in further detail with reference to the following examples and drawings, but the present invention is not limited thereto.
Examples
As shown in fig. 1(a) -1 (b) and 2(a) -2 (c), the present invention relates to an easily removable and repairable personalized femoral stem prosthesis, which comprises a personalized NiTi alloy porous biological femoral stem sleeve 1 with memory effect and a personalized femoral stem main body 2. The personalized femoral stem sleeve conforms to, but is slightly smaller than, the intramedullary canal. The femoral stem body 2 consists of a head part 3, a neck part 4 and a marrow-imitating cavity 5, wherein the marrow-imitating cavity in the femoral stem body is arranged in the femoral stem sleeve; the femoral stem sleeve is formed by a NiTi alloy porous structure with a memory effect, and utilizes the permanent super elasticity of the NiTi alloy to tightly hold, clamp and fix with the medullary cavity simulating structure in the femoral stem main body on the one hand, and contact and fix with the medullary cavity on the other hand and provide continuous stress by utilizing the super elasticity of the NiTi alloy.
Under the natural form, the handle sleeve is a biological porous structure, and the inner side and the outer side of the handle sleeve are not the same in porosity, but have a certain degree of difference. When the handle sleeve is expanded, the expanded biological porous structure has the size equal to the size of bone in which both sides of the femur can grow. The personalized biological porous structure handle sleeve has a two-way memory effect, the temperature point of phase change is 10-20 ℃ of body temperature, namely the phase change temperature point is taken as a boundary line, and the personalized handle sleeve correspondingly expands and contracts. When the temperature is lower than the phase transition temperature point, the personalized handle sleeve is in a contraction state, and the handle sleeve is separated from the femoral handle. When the temperature is higher than the phase transition temperature point, the personalized handle sleeve is in an expansion state and clasps the personalized femoral handle main body.
In order to solve the problem that the traditional bone cement is fixed and is difficult to repair, the utility model discloses a biological porous thighbone handle cover and its characteristics include that the handle cover accords with the pulp cavity structure, but slightly are less than the pulp cavity structure, the handle cover adopts the NiTi alloy 3D printing of two-way memory effect to take shape and through the memory training of later stage, the handle cover is a nature expansion type porous structure in the form, and according to the atress analysis, there is certain change in thighbone inside and outside porosity; the size of the handle sleeve natural expansion type porous structure after expansion is smaller than or equal to the size of the bone ingrowth; the memory effect of the handle sleeve takes the temperature lower than the body temperature by 10-20 ℃ as a phase transition temperature point, the handle sleeve belongs to a contraction state when the temperature is lower than the phase transition temperature point, and the handle sleeve is an expansion state when the temperature is higher than the phase transition temperature point; after the stem sleeve is implanted into a human body, the stem sleeve naturally expands under the influence of the temperature of the human body, one surface of the expanded stem sleeve naturally contacts with bones and has certain pretightening force, and the other surface of the expanded stem sleeve naturally clasps the personalized femoral stem main body to form a firm combination; when the femoral stem main body is controlled at a cold temperature, because the cold conduction is faster, the temperature of the side of the stem sleeve contacted with the femoral stem is reduced, the temperature is firstly below a phase change temperature point to generate phase change, the stem sleeve is contracted, the individualized femoral stem is separated from the stem sleeve, and the femoral stem main body can be removed and replaced; when the femoral handle sleeve needs to be removed and renovated, the femoral handle sleeve is continuously cooled, the handle sleeve is integrally contracted, and the handle sleeve and the bone contact surface have continuous stress contraction and are slowly separated from the bone without influencing other bone structures in the femoral medullary cavity.
As shown in fig. 4, the utility model relates to a method of design and manufacturing of individualized femoral stem false body of easy excision renovation acquires patient CT + MRI through medical equipment and fuses medical image, carries out three-dimensional reconstruction to individualized femoral medullary cavity, according to atress and sclerotin analysis, designs the femoral stem main part that matches completely with the medullary cavity, utilizes the selective melting technique of laser, 3D prints individualized femoral stem main part of light weight high strength titanium alloy. The individualized NiTi alloy porous biological femoral stem sleeve is characterized in that the shape of the expanded state stem sleeve matched with a bone marrow cavity is designed through medical images, the gradient porous structure matched with stress and bone is designed according to stress and bone analysis, the design of the individualized femoral stem sleeve basically matched with the bone marrow cavity is guaranteed through the shape of the expanded state stem sleeve, the gradient porous structure and the natural expansion type porous structure, the individualized NiTi alloy porous biological femoral stem sleeve with the memory effect is printed in a 3D mode through a material adding technology, the stem sleeve is trained in a double-pass effect mode, and then the individualized NiTi alloy porous biological femoral stem sleeve is matched with an individualized femoral stem main body to be assembled for use.
As shown in fig. 5, before the operation, the personalized NiTi alloy porous biological femoral stem sleeve stored at a low temperature and having a memory effect is matched with the personalized femoral stem main body to be assembled and implanted into a human body, the stem sleeve is naturally expanded under the influence of the temperature of the human body after being implanted into the human body, one surface of the expanded stem sleeve is naturally matched and contacted with a bone and has a certain pretightening force, and the other surface of the expanded stem sleeve is naturally clasped with the personalized femoral stem main body to form a firm combined body. After the operation is finished, the bone naturally grows and is embedded into the handle sleeve. When cold temperature is applied to the femoral stem main body, because the cold conduction is fast, the temperature of the side of the stem sleeve contacted with the femoral stem is reduced, the temperature is firstly below the phase change temperature point to generate phase change, the stem sleeve is contracted, the individualized femoral stem is separated from the stem sleeve, and the femoral stem main body can be removed and replaced; when the femoral stem main body is continuously cooled, the stem sleeve is integrally shrunk, the contact surface of the stem sleeve and the bone has continuous stress shrinkage at the moment, the stem sleeve and the bone are slowly separated from the bone without influencing other bone structures in a femoral medullary cavity, and the stem sleeve and the femoral stem main body can be replaced at the same time, as shown in fig. 3(a) -3 (c).
The above embodiments are preferred embodiments of the present invention, but the embodiments of the present invention are not limited to the above embodiments, and any other changes, modifications, substitutions, combinations, and simplifications which do not depart from the spirit and principle of the present invention should be equivalent replacement modes, and all are included in the scope of the present invention.
Claims (4)
1. The personalized femoral stem prosthesis is characterized by comprising a personalized NiTi alloy porous biological femoral stem sleeve with a memory effect and a personalized femoral stem main body, wherein the shape of the femoral stem sleeve is matched with the medullary cavity structure, the femoral stem sleeve is smaller than the medullary cavity structure, and the femoral stem sleeve is of a natural expansion type porous structure;
the femoral stem body consists of a head part, a neck part and a marrow-imitating cavity, wherein the marrow-imitating cavity in the femoral stem body is arranged in the femoral stem sleeve; the femoral stem sleeve is formed by a NiTi alloy porous structure with a memory effect.
2. The prosthesis of claim 1, wherein the natural expanding porous structure has a size after expansion that is smaller than or equal to a bone ingrowth size.
3. The prosthesis of claim 1, wherein the natural expanded porous structure has a porosity inside and outside the femur that varies with stress conditions of the proximal femur under force.
4. The prosthesis of claim 1, wherein the femoral stem sleeve is formed by 3D printing of a memory-effect NiTi alloy and is formed by a later memory training.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820343899.0U CN210077954U (en) | 2018-03-14 | 2018-03-14 | Individualized femoral stem prosthesis easy to remove and repair |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820343899.0U CN210077954U (en) | 2018-03-14 | 2018-03-14 | Individualized femoral stem prosthesis easy to remove and repair |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN210077954U true CN210077954U (en) | 2020-02-18 |
Family
ID=69469341
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201820343899.0U Active CN210077954U (en) | 2018-03-14 | 2018-03-14 | Individualized femoral stem prosthesis easy to remove and repair |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN210077954U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115040292A (en) * | 2021-05-21 | 2022-09-13 | 天津理工大学 | Bone-prosthesis interface relative displacement device |
| CN116269946A (en) * | 2023-05-12 | 2023-06-23 | 北京爱康宜诚医疗器材有限公司 | Femoral head surface replacement prosthesis |
-
2018
- 2018-03-14 CN CN201820343899.0U patent/CN210077954U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115040292A (en) * | 2021-05-21 | 2022-09-13 | 天津理工大学 | Bone-prosthesis interface relative displacement device |
| CN116269946A (en) * | 2023-05-12 | 2023-06-23 | 北京爱康宜诚医疗器材有限公司 | Femoral head surface replacement prosthesis |
| CN116269946B (en) * | 2023-05-12 | 2023-10-27 | 北京爱康宜诚医疗器材有限公司 | Femoral head surface replacement prosthesis |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN108451671B (en) | Personalized femoral stem prosthesis easy to remove and repair and manufacturing method | |
| CN110191691B (en) | Modular expansion component | |
| EP2730254B1 (en) | Dual modulus hip stem | |
| AU2017376662B2 (en) | Implants with frangible fastener port plugs | |
| CN101128164B (en) | Joint prosthesis made of a titanium-molybdenum-alloy | |
| CN210077954U (en) | Individualized femoral stem prosthesis easy to remove and repair | |
| EP2836166B1 (en) | Prosthetic element for bone extremities such as fingers or toes, or for teeth, and corresponding production method | |
| CN104042361A (en) | Femoral Component For An Implantable Hip Prosthesis | |
| CN105326583A (en) | Ilium defect reconstructive prosthesis | |
| JP6668406B2 (en) | Fused femoral stem system | |
| JP2021526061A (en) | Knuckle prosthesis and its manufacturing method | |
| US20180228616A1 (en) | Additive manufactured femoral components | |
| CN108904104A (en) | It is a kind of based on 3D printing personalization acetabular bone and bone inner support prosthese and the surgical guide being used cooperatively with supporting prostheses and preparation method | |
| CN107951599B (en) | Femoral stem prosthesis assembly | |
| CN209316157U (en) | A kind of ankle prosthesis shin bone sidepiece part | |
| CN205286615U (en) | Artifical false body of full sacrum | |
| CN113081402B (en) | Femoral stem prosthesis | |
| CN203576699U (en) | Patella prosthesis structure | |
| CN109330748A (en) | A kind of ankle prosthesis shin bone sidepiece part | |
| CN212308139U (en) | Femoral prosthesis for retaining femoral head | |
| Mohammed et al. | Evaluation of Novel Prosthesis Implant Adapter by Finite Element Analysis | |
| JP2011514224A (en) | Prosthetic body for femoral prosthesis | |
| CN206151635U (en) | Ilium prosthesis | |
| Zheng et al. | 3D finite element analysis of bone stress around distally osteointegrated implant for artificial limb attachment | |
| CN211356077U (en) | Orthopedic implant die and fastening device thereof |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |