CN114081684A - Hip joint femoral stem with good fastening effect - Google Patents
Hip joint femoral stem with good fastening effect Download PDFInfo
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- CN114081684A CN114081684A CN202111399189.2A CN202111399189A CN114081684A CN 114081684 A CN114081684 A CN 114081684A CN 202111399189 A CN202111399189 A CN 202111399189A CN 114081684 A CN114081684 A CN 114081684A
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
- A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
- A61F2/02—Prostheses implantable into the body
- A61F2/30—Joints
- A61F2/32—Joints for the hip
- A61F2/36—Femoral heads ; Femoral endoprostheses
- A61F2/3601—Femoral heads ; Femoral endoprostheses for replacing only the epiphyseal or metaphyseal parts of the femur, e.g. endoprosthetic femoral heads or necks directly fixed to the natural femur by internal fixation devices
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
- A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
- A61F2/02—Prostheses implantable into the body
- A61F2/30—Joints
- A61F2/32—Joints for the hip
- A61F2/36—Femoral heads ; Femoral endoprostheses
- A61F2/3609—Femoral heads or necks; Connections of endoprosthetic heads or necks to endoprosthetic femoral shafts
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
- A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
- A61F2/02—Prostheses implantable into the body
- A61F2/30—Joints
- A61F2002/30001—Additional features of subject-matter classified in A61F2/28, A61F2/30 and subgroups thereof
- A61F2002/30003—Material related properties of the prosthesis or of a coating on the prosthesis
- A61F2002/30004—Material related properties of the prosthesis or of a coating on the prosthesis the prosthesis being made from materials having different values of a given property at different locations within the same prosthesis
- A61F2002/30019—Material related properties of the prosthesis or of a coating on the prosthesis the prosthesis being made from materials having different values of a given property at different locations within the same prosthesis differing in mechanical expandability, e.g. in mechanical, self- or balloon expandability
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
- A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
- A61F2/02—Prostheses implantable into the body
- A61F2/30—Joints
- A61F2002/30001—Additional features of subject-matter classified in A61F2/28, A61F2/30 and subgroups thereof
- A61F2002/30316—The prosthesis having different structural features at different locations within the same prosthesis; Connections between prosthetic parts; Special structural features of bone or joint prostheses not otherwise provided for
- A61F2002/30317—The prosthesis having different structural features at different locations within the same prosthesis
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
- A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
- A61F2/02—Prostheses implantable into the body
- A61F2/30—Joints
- A61F2/30767—Special external or bone-contacting surface, e.g. coating for improving bone ingrowth
- A61F2/30771—Special external or bone-contacting surface, e.g. coating for improving bone ingrowth applied in original prostheses, e.g. holes or grooves
- A61F2002/3082—Grooves
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
- A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
- A61F2/02—Prostheses implantable into the body
- A61F2/30—Joints
- A61F2/30767—Special external or bone-contacting surface, e.g. coating for improving bone ingrowth
- A61F2/30771—Special external or bone-contacting surface, e.g. coating for improving bone ingrowth applied in original prostheses, e.g. holes or grooves
- A61F2002/3082—Grooves
- A61F2002/30827—Plurality of grooves
- A61F2002/30831—Plurality of grooves perpendicular with respect to each other
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
- A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
- A61F2/02—Prostheses implantable into the body
- A61F2/30—Joints
- A61F2/32—Joints for the hip
- A61F2/36—Femoral heads ; Femoral endoprostheses
- A61F2/3609—Femoral heads or necks; Connections of endoprosthetic heads or necks to endoprosthetic femoral shafts
- A61F2002/3611—Heads or epiphyseal parts of femur
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
- A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
- A61F2/02—Prostheses implantable into the body
- A61F2/30—Joints
- A61F2/32—Joints for the hip
- A61F2/36—Femoral heads ; Femoral endoprostheses
- A61F2/3609—Femoral heads or necks; Connections of endoprosthetic heads or necks to endoprosthetic femoral shafts
- A61F2002/3625—Necks
Landscapes
- Health & Medical Sciences (AREA)
- Orthopedic Medicine & Surgery (AREA)
- Cardiology (AREA)
- Oral & Maxillofacial Surgery (AREA)
- Transplantation (AREA)
- Engineering & Computer Science (AREA)
- Biomedical Technology (AREA)
- Heart & Thoracic Surgery (AREA)
- Vascular Medicine (AREA)
- Life Sciences & Earth Sciences (AREA)
- Animal Behavior & Ethology (AREA)
- General Health & Medical Sciences (AREA)
- Public Health (AREA)
- Veterinary Medicine (AREA)
- Prostheses (AREA)
Abstract
A hip joint femoral stem with good fastening effect relates to the technical field of medical instruments. Aiming at solving the problem that the existing hip joint femoral stem prosthesis is frequently subjected to bending load in the walking process of a human body; because one side is pressed and the other side is pulled, when the traditional positive Poisson ratio material is bent and is under the action of bending load, the pressed side of the traditional positive Poisson ratio material transversely expands and deforms, and the pulled side of the traditional positive Poisson ratio material contracts and deforms; the result of this deformation characteristic is that the prosthesis has a good contact effect between its compression side and the femur under bending load, while its tension side creates a gap with the implanted femur, leading to problems of loosening phenomena. The femoral neck, the upper main body bending section and the lower main body straight section are sequentially arranged from top to bottom, the femoral neck, the upper main body bending section and the lower main body straight section are integrally arranged, and the outer surface of the upper main body bending section is processed with a penetrating contact crack. The invention is suitable for the technical field of medical instruments.
Description
Technical Field
The invention relates to the technical field of medical instruments, in particular to a hip joint femoral stem with a good fastening effect.
Background
The hip joint femoral stem prosthesis is a surgical implant used for replacing a hip joint femoral part of a human body. At present, cement type and biological type hip joint femoral stems exist, the cement type needs to be fixed by filling bone cement, and the biological type needs to be fixed by processes of spraying titanium powder or sintering titanium beads on the surface. The hip joint femoral stem is combined with a full acetabulum, a lining and a ball head for use in hip joint total hip replacement surgery. Although the prior hip joint femoral stem prosthesis structure can replace the hip joint femoral part, the prior hip joint femoral stem prosthesis structure has the following defects in practical use:
1. the conventional hip joint femoral stem prosthesis is easy to generate gaps and cause loosening phenomenon between the conventional hip joint femoral stem prosthesis and implanted thighbones in the frequent use process, and the service life of the prosthesis is greatly influenced. The short service life can lead to frequent replacement and cause more harm to human bodies.
2. The gap between the prosthesis and the femur provides a passage for foreign debris such as bone wear particles to enter, thereby stimulating an extravagant response of the patient's immune system and eventually triggering inflammatory osteoporosis.
3. Most existing hip implants are made of solid metal by a casting and moulding process, with a stiffness significantly higher than that of natural bone. Once the metal implant is fixed in place, most of the physiological load is transferred to the implant, where the stress is "shielded" away from the surrounding femur. As healthy bones are continually remodeled in response to the load they are placed under, load transfer in the implanted femur leads to under-loading of the bone, resulting in bone resorption and loss of bone mass. This phenomenon is called bone loss secondary to stress shielding. The reduction in bone mass can lead to serious complications, including periprosthetic fractures, while the mismatch in elastic modulus between the implant and the bone can lead to thigh pain. Stress shielding also impedes bone growth and reduces the quality of the remaining bone mass, resulting in a significant increase in the risk of fractures and aseptic loosening when revision surgery is performed.
4. At present, a novel hip joint femoral stem mixed by negative Poisson's ratio material and positive Poisson's ratio material is reported abroad. The improved mode has the advantages that the fastening effect of the prosthesis can be well improved, but the lattice material with complex configuration and poor stability is used, on one hand, the production and processing technology is complex, on the other hand, burrs exist on the surface of the material, and the binding affinity in the bone is low, so the design practicability is not high.
In summary, the existing hip joint femoral stem prosthesis is subjected to bending load frequently during walking of a human body. When the traditional positive Poisson ratio material is bent under the action of bending load, the compression side of the traditional positive Poisson ratio material is subjected to expansion deformation transversely, and the tension side of the traditional positive Poisson ratio material is subjected to contraction deformation. The result of this deformation characteristic is that the prosthesis has a good contact effect between its compression side and the femur under bending load, while its tension side creates a gap with the implanted femur, leading to problems of loosening phenomena.
Disclosure of Invention
The invention aims to solve the problem that the existing hip joint femoral stem prosthesis is frequently subjected to bending load in the walking process of a human body; because one side is pressed and the other side is pulled, when the traditional positive Poisson ratio material is bent and is under the action of bending load, the pressed side of the traditional positive Poisson ratio material transversely expands and deforms, and the pulled side of the traditional positive Poisson ratio material contracts and deforms; the result of this deformation characteristic is that the prosthesis has a good contact effect between its compression side and the femur under bending load, while its tension side creates a gap with the implanted femur, leading to the problem of loosening, and a hip stem with good fastening effect is proposed.
The invention relates to a hip joint femoral stem with good fastening effect, which comprises a femoral neck, an upper main body bending section and a lower main body straight section; the femoral neck, the upper main body bending section and the lower main body linear section are sequentially arranged from top to bottom, the femoral neck, the upper main body bending section and the lower main body linear section are integrally arranged, and a penetrating contact crack is processed on the outer surface of the upper main body bending section;
further, the penetrating contact type crack comprises a plurality of crack units, and the crack units are uniformly staggered;
furthermore, each crack unit comprises two crack grooves which are vertically arranged, and two ends of each crack are respectively provided with a crack-stopping hole;
furthermore, each crack unit comprises a pair of parallel cracks, and two ends of each crack are respectively provided with a crack stopping hole;
furthermore, each crack unit comprises three cracks, one ends of the three cracks are intersected, every two cracks are arranged at an angle of 120 degrees, and the other end of each crack is provided with a crack stopping hole;
furthermore, each crack unit comprises three cracks, the three cracks are arranged in a clockwise sequence, two adjacent cracks form an angle of 60 degrees, and two ends of each crack are respectively provided with a crack stopping hole;
further, the width of the crack is less than or equal to 0.2 mm;
furthermore, the outer surface of the upper main body bending section is processed with a penetrating contact type crack to form a novel mechanical metamaterial, the femoral stem prosthesis adopting the novel mechanical metamaterial can well improve the contact condition with the femur, has a good fastening anti-falling effect, and greatly prolongs the service life of the femoral stem; the invention still takes the materials with better biocompatibility such as titanium alloy and the like as the parent materials. In order to enable the material to have the deformation effect, the novel metamaterial used in the invention is pre-provided with a penetrating contact type crack, and meanwhile, in order to relieve the problem of serious stress concentration at the tip of the stress crack, the end part of each pre-formed crack of the novel mechanical metamaterial is provided with a circular crack-stopping hole.
Compared with the prior art, the invention has the following beneficial effects:
the invention overcomes the defects of the prior art, adopts the outer surface of the upper main body bending section to process the penetrating contact type crack to form a novel mechanical metamaterial, and the material transversely expands when being subjected to the independent tensile stress, the independent compression stress or the combined tension and compression stress, and the unique mechanical property can ensure that the hip joint femoral stem always keeps close contact with the implanted femur in the use process, thereby having very excellent fastening effect and effectively prolonging the service life of the prosthesis;
the femoral stem prosthesis adopting the novel mechanical metamaterial can well improve the contact condition with the femur, and has strong practicability.
Drawings
Fig. 1 is a front view of a hip stem according to the invention with a good fastening effect;
FIG. 2 is a view of a contact-type through crack pattern in a hip stem according to the present invention with good fastening effect;
FIG. 3 is a perspective view of a contact crack pattern in a hip stem with good fastening effect according to the present invention;
FIG. 4 is a perspective view of a contact crack pattern in a hip stem with good fastening effect according to the present invention;
FIG. 5 is a perspective view of a contact crack pattern in a hip stem with good fastening effect according to the present invention;
FIG. 6 is a schematic diagram of uniaxial tension, compression and bending deformation trends of a traditional metal material, a negative Poisson's ratio material and a novel mechanical metamaterial.
Detailed Description
The first embodiment is as follows: the present embodiment is described with reference to fig. 1 and 6, and a hip stem with excellent fastening effect according to the present embodiment includes a femoral neck 1, an upper body curved section 2, and a lower body straight section 3; the femoral neck 1, the upper main body bending section 2 and the lower main body straight section 3 are sequentially arranged from top to bottom and are integrally arranged, and the outer surface of the upper main body bending section 2 is processed with a penetrating contact crack;
according to the specific embodiment, the outer surface of the upper main body bending section 2 is processed with the penetrating contact type cracks to form the novel mechanical metamaterial, the femoral stem prosthesis adopting the novel mechanical metamaterial can well improve the contact condition with the femur, the good fastening anti-falling effect is achieved, and the service life of the femoral stem is greatly prolonged; the invention still takes the materials with better biocompatibility such as titanium alloy and the like as the parent materials. In order to enable the material to have the deformation effect, the novel metamaterial used in the invention is pre-provided with a penetrating contact type crack, and meanwhile, in order to relieve the problem of serious stress concentration at the tip of the stress crack, the end part of each pre-formed crack of the novel mechanical metamaterial is provided with a circular crack-stopping hole; the bone handle with the penetrating contact type cracks is subjected to stretching, compressing and bending experiments, a deformation trend schematic diagram is obtained, compared with the traditional metal material and a negative Poisson ratio material, the penetrating contact type cracks are processed on the outer surface of the upper main body bending section 2, and the deformation trend of the novel mechanical metamaterial is relatively uniform, so that the novel mechanical metamaterial has an effect of expanding transversely when being subjected to independent tensile stress and independent compression stress or combined tension and compression stress, the unique mechanical property can ensure that the hip joint femoral handle is always kept in close contact with the implanted femur in the using process, the fastening effect is very excellent, and the service life of the prosthesis can be effectively prolonged;
the tension-compression Poisson ratio, rigidity and strength of the novel mechanical metamaterial have good designability, the material and the rigidity of bones can be prevented from being mismatched by adjusting structural parameters, stress shielding is relieved, and discomfort of a patient is relieved;
the femoral neck 1, the upper main body bending section 2 and the lower main body linear section 3 in the bone handle are all made of the same material, so that the influence of transition butt joint parts made of different materials is avoided. In addition, the surface integrity is still better maintained, and the surface of the bone is favorably contacted with the surface of the bone; the femoral stem prosthesis can achieve the design goal by processing the penetrating contact type cracks on the outer surface of the upper main body bending section 2, has simple preparation method and low cost, is beneficial to implementation and clinical application, and is suitable for the requirements of patients.
The second embodiment is as follows: the present embodiment is described with reference to fig. 2, and is a further limitation of the stem according to the first embodiment, and the hip stem having a good fastening effect according to the present embodiment is configured such that the contact-penetration crack includes a plurality of crack units 4, and the plurality of crack units 4 are arranged in a uniformly staggered manner.
The third concrete implementation mode: the present embodiment is described with reference to fig. 2, and is a further limitation to the bone handle according to the second embodiment, in which each of the crack units 4 includes two crack grooves, the two crack grooves are vertically arranged, and two ends of each crack are respectively provided with one crack stopping hole;
this embodiment adopts the crackle unit to include two crackle grooves, and two crackle grooves set up perpendicularly, and the both ends of every crackle are equipped with one respectively and hinder the crack hole, and novel hip joint femoral stem takes place the crooked segmental type 2 of upper portion main part in the use and takes place the crooked combination load effect of periodic tension-compression, and its unique deformation behavior can be effectual novel false body of assurance with implanted into femoral component contact well, has fine fastening effect.
The fourth concrete implementation mode: the present embodiment is described with reference to fig. 3, and is a further limitation of the stem according to the second embodiment, and the hip femoral stem according to the present embodiment with a good fastening effect includes a pair of parallel cracks in each crack unit 4, and each crack has two ends provided with one crack stop hole.
The fifth concrete implementation mode: the present embodiment is described with reference to fig. 4, and is a further limitation of the stem according to the second embodiment, and the hip joint femoral stem according to the present embodiment with a good fastening effect includes three cracks in each of the crack units 4, one end of each of the three cracks intersects with each other, and every two cracks are disposed at an angle of 120 °, and the other end of each crack is provided with a crack-stopping hole.
The sixth specific implementation mode: the present embodiment is described with reference to fig. 5, and is a further limitation of the stem according to the second embodiment, and the hip joint femoral stem according to the present embodiment with a good fastening effect includes three cracks in each of the crack units 4, the three cracks are arranged in a clockwise order, every two adjacent cracks are arranged at an angle of 60 °, and two ends of each crack are respectively provided with one anti-crack hole.
The seventh embodiment: the present embodiment will be described with reference to fig. 5, which is a further limitation of the stem according to the third, fourth, fifth or sixth embodiment, and the hip stem according to the present embodiment having a good fastening effect has a crack width of 0.2mm or less.
Claims (7)
1. The utility model provides a hip joint femoral stem with good fastening effect which characterized in that: it comprises a femoral neck (1), an upper main body bending section (2) and a lower main body straight section (3); the femoral neck (1), the upper main body bending section (2) and the lower main body straight section (3) are sequentially arranged from top to bottom and are integrally arranged, and the outer surface of the upper main body bending section (2) is processed with a penetrating contact crack.
2. The hip stem with good fastening effect according to claim 1, characterized in that: the penetrating contact type crack comprises a plurality of crack units (4), and the crack units (4) are uniformly arranged in a staggered mode.
3. The hip stem with good fastening effect according to claim 2, characterized in that: each crack unit (4) comprises two crack grooves which are vertically arranged, and two ends of each crack are respectively provided with a crack stopping hole.
4. The hip stem with good fastening effect according to claim 2, characterized in that: each crack unit (4) comprises a pair of parallel cracks, and two ends of each crack are respectively provided with a crack stopping hole.
5. The hip stem with excellent fastening effect as claimed in claim 2, wherein: each crack unit (4) comprises three cracks, one ends of the three cracks are intersected, every two cracks are arranged at an angle of 120 degrees, and the other end of each crack is provided with a crack stopping hole.
6. The hip stem with excellent fastening effect as claimed in claim 2, wherein: each crack unit (4) comprises three cracks, the three cracks are arranged in a clockwise sequence, two adjacent cracks are arranged at an angle of 60 degrees, and two ends of each crack are respectively provided with a crack stopping hole.
7. A hip stem with good tightening effect according to claim 3, 4, 5 or 6, characterized in that: the width of the crack is less than or equal to 0.2 mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111399189.2A CN114081684A (en) | 2021-11-19 | 2021-11-19 | Hip joint femoral stem with good fastening effect |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111399189.2A CN114081684A (en) | 2021-11-19 | 2021-11-19 | Hip joint femoral stem with good fastening effect |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN114081684A true CN114081684A (en) | 2022-02-25 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202111399189.2A Pending CN114081684A (en) | 2021-11-19 | 2021-11-19 | Hip joint femoral stem with good fastening effect |
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| Country | Link |
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| CN (1) | CN114081684A (en) |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20070122590A1 (en) * | 2005-11-29 | 2007-05-31 | Haresh Lalvani | Multi-directional and variably expanded sheet material surfaces |
| US20110059291A1 (en) * | 2009-09-07 | 2011-03-10 | Boyce Christopher M | Structured materials with tailored isotropic and anisotropic poisson's ratios including negative and zero poisson's ratios |
| US20140260281A1 (en) * | 2013-03-15 | 2014-09-18 | Rolls-Royce Canada, Ltd. | Auxetic structure with stress-relief features |
-
2021
- 2021-11-19 CN CN202111399189.2A patent/CN114081684A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20070122590A1 (en) * | 2005-11-29 | 2007-05-31 | Haresh Lalvani | Multi-directional and variably expanded sheet material surfaces |
| US20110059291A1 (en) * | 2009-09-07 | 2011-03-10 | Boyce Christopher M | Structured materials with tailored isotropic and anisotropic poisson's ratios including negative and zero poisson's ratios |
| US20140260281A1 (en) * | 2013-03-15 | 2014-09-18 | Rolls-Royce Canada, Ltd. | Auxetic structure with stress-relief features |
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