CN215019752U - Femoral stem with chamfer at inner side - Google Patents
Femoral stem with chamfer at inner side Download PDFInfo
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- CN215019752U CN215019752U CN202120296357.4U CN202120296357U CN215019752U CN 215019752 U CN215019752 U CN 215019752U CN 202120296357 U CN202120296357 U CN 202120296357U CN 215019752 U CN215019752 U CN 215019752U
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Abstract
The application provides a femoral stem of medial zone chamfer includes: a femoral stem cone part, a femoral stem neck part and a femoral stem body; the femoral stem handle body comprises a handle body proximal end, a handle body middle section and a handle body distal end which are sequentially arranged from top to bottom; the neck part of the femoral stem is arranged at the top of the near end of the stem body; the femoral stem cone part is connected with the proximal end of the stem body through the femoral stem neck part; the middle section of the handle body comprises a handle body inner side close to the inner side of the human femur and a handle body outer side opposite to the handle body inner side; the cross section of the inner side of the handle body is a rectangle with a chamfer or a fillet; wherein, the chamfer or the fillet is arranged at the end part of the inner side of the handle body far away from the outer side of the handle body; the length of the right-angle side of the chamfer or the radius of the fillet is gradually increased from the lower part of the inner side of the handle body to the upper part of the inner side of the handle body; the length of the right-angle side of the chamfer at the bottom of the inner side of the handle body or the radius of the fillet at the bottom of the inner side of the handle body is 0mm-15 mm. This application can be so that the femoral stem installation of being convenient for, strengthens the anti rotational stability of femoral stem simultaneously, prevents to lead to the femoral stem to take place to rotate by patient's activity and becomes flexible.
Description
Technical Field
The application relates to the technical field of medical instruments, in particular to a femoral stem with a chamfer at the inner side.
Background
The femoral stem is an important component of the artificial hip joint, can replace a diseased bone joint and complete the dynamic function of the replaced part, and structurally meets two characteristics, namely: good structural compatibility with the femoral medullary cavity (good matching and stable sealing of the femoral stem and the femur) and biomechanical compatibility with bone tissues, in an attempt to transfer non-physiological loads from the acetabulum and transmitted from the femoral head and the femoral neck to the femoral stem to the physiological femur of a patient as much as possible according to the size and distribution form of the physiological loads, which requires that the femoral stem conforms to the anatomical characteristics of the human body and is reasonably combined.
In the prior art, the cross-sectional shape of the inner side of the femoral stem body is mostly a curve, such as a parabola, an arc line, and the like.
However, after the arc-shaped femoral stem with the same curved cross section is implanted into the femoral bone marrow cavity of a human body, the femoral stem is easy to rotate and loosen due to the movement of a patient, the anti-rotation stability of the femoral stem on the structural design is insufficient, and further other complications can be caused.
SUMMERY OF THE UTILITY MODEL
In view of the problems, the present application has been developed to provide a medial chamfered femoral stem that overcomes or at least partially solves the problems, comprising:
a femoral stem with a medial chamfer, comprising: a femoral stem cone part, a femoral stem neck part and a femoral stem body;
the femoral stem handle body comprises a handle body proximal end, a handle body middle section and a handle body distal end which are sequentially arranged from top to bottom; the femoral stem neck is arranged at the top of the proximal end of the stem body; the femoral stem conical part is connected with the proximal end of the stem body through the femoral stem neck part; the middle section of the handle body comprises a handle body inner side close to the inner side of the human femur and a handle body outer side opposite to the handle body inner side;
the cross section of the inner side of the handle body is a rectangle with a chamfer; the chamfer is arranged at the end part of the inner side of the handle body, which is far away from the outer side of the handle body; the length of the right-angle side of the chamfer angle is gradually increased from the lower part of the inner side of the handle body to the upper part of the inner side of the handle body; the length of the right-angle edge of the chamfer at the bottom of the inner side of the handle body is 0-15 mm;
or the cross section of the inner side of the handle body is a rectangle with round corners; the fillet is arranged at the end part of the inner side of the handle body far away from the outer side of the handle body; the radius of the fillet is gradually increased from the lower part of the inner side of the handle body to the upper part of the inner side of the handle body; the radius of the fillet at the bottom of the inner side of the handle body is 0mm-15 mm.
Preferably, the difference between the lengths of the right-angle sides of the chamfer at the top of the inner side of the handle body and the chamfer at the bottom of the inner side of the handle body is 0.01-15 mm;
or the difference value of the radiuses of the round angle at the top of the inner side of the handle body and the round angle at the bottom of the inner side of the handle body is 0.01-15 mm.
Preferably, the chamfers are arranged on two sides of the end part of the inner side of the handle body far away from the outer side of the handle body;
or the fillets are arranged on two sides of the end part of the inner side of the handle body, which is far away from the outer side of the handle body.
Preferably, the angle of the chamfer is 0.1-89.9 °.
Preferably, the included angle between the central axis of the neck part of the femoral stem and the central axis of the stem body of the femoral stem is 125-145 degrees.
Preferably, the surface of the femoral stem handle body is sprayed with a titanium coating and/or a hydroxyapatite coating and/or a sand coating.
The application has the following advantages:
in the embodiments of the present application, through the femoral stem taper, the femoral stem neck, and the femoral stem body; the femoral stem handle body comprises a handle body proximal end, a handle body middle section and a handle body distal end which are sequentially arranged from top to bottom; the femoral stem neck is arranged at the top of the proximal end of the stem body; the femoral stem conical part is connected with the proximal end of the stem body through the femoral stem neck part; the middle section of the handle body comprises a handle body inner side close to the inner side of the human femur and a handle body outer side opposite to the handle body inner side; the cross section of the inner side of the handle body is a rectangle with a chamfer; the chamfer is arranged at the end part of the inner side of the handle body, which is far away from the outer side of the handle body; the length of the right-angle side of the chamfer angle is gradually increased from the lower part of the inner side of the handle body to the upper part of the inner side of the handle body; the length of the right-angle edge of the chamfer at the bottom of the inner side of the handle body is 0-15 mm; or the cross section of the inner side of the handle body is a rectangle with round corners; the fillet is arranged at the end part of the inner side of the handle body far away from the outer side of the handle body; the radius of the fillet is gradually increased from the lower part of the inner side of the handle body to the upper part of the inner side of the handle body; the radius of the fillet at the bottom of the inner side of the handle body is 0mm-15mm, so that the femoral handle is convenient to mount, the anti-rotation stability of the femoral handle is enhanced, the femoral handle is prevented from rotating and loosening due to the movement of a patient, and further other complications are avoided.
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 femoral stem with a chamfer on the inner side according to an embodiment of the present application;
FIG. 2 is a cross-sectional view taken at A-A of FIG. 1;
FIG. 3 is a cross-sectional view taken at B-B of FIG. 1;
FIG. 4 is a cross-sectional view taken at A-A of FIG. 1;
fig. 5 is a cross-sectional view at B-B in fig. 1.
The reference numbers in the drawings of the specification are as follows:
1. a femoral stem taper; 2. a femoral stem neck; 3. a femoral stem body; 31. a handle body proximal end; 32. a middle handle body section; 321. the inner side of the handle body; 322. the outer side of the handle body; 33. a handle distal end.
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.
Referring to fig. 1 to 5, a femoral stem with a chamfer on the inner side provided by an embodiment of the application is shown, which comprises: a femoral stem cone part 1, a femoral stem neck part 2 and a femoral stem body 3;
the femoral stem body 3 comprises a stem body proximal end 31, a stem body middle section 32 and a stem body distal end 33 which are sequentially arranged from top to bottom; the femoral stem neck 2 is arranged on the top of the stem body proximal end 31; the femoral stem taper 1 is connected with the stem proximal end 31 through the femoral stem neck 2; the handle middle section 32 comprises a handle inner side 321 close to the inner side of the human femur and a handle outer side 322 opposite to the handle inner side 321;
the cross section of the inner side 321 of the handle body is a rectangle with a chamfer; wherein the chamfer is provided at an end of the shank inner side 321 remote from the shank outer side 322; the length of the right-angle side of the chamfer angle is gradually increased from the lower part of the inner side 321 of the handle body to the upper part of the inner side 321 of the handle body; the length of the right-angle side of the chamfer at the bottom of the inner side 321 of the handle body is 0mm-15mm, preferably 1mm, 5mm or 10 mm;
or, the cross section of the handle body inner side 321 is a rectangle with round corners; wherein the fillet is disposed at an end of the handle inner side 321 away from the handle outer side 322; the radius of the fillet gradually increases from the lower part of the handle body inner side 321 to the upper part of the handle body inner side 321; the radius of the fillet at the bottom of the handle body inner side 321 is 0mm-15mm, preferably 1mm, 5mm or 10 mm.
In the embodiment of the application, the femoral stem taper part 1, the femoral stem neck part 2 and the femoral stem body 3 are arranged; the femoral stem body 3 comprises a stem body proximal end 31, a stem body middle section 32 and a stem body distal end 33 which are sequentially arranged from top to bottom; the femoral stem neck 2 is arranged on the top of the stem body proximal end 31; the femoral stem taper 1 is connected with the stem proximal end 31 through the femoral stem neck 2; the handle middle section 32 comprises a handle inner side 321 close to the inner side of the human femur and a handle outer side 322 opposite to the handle inner side 321; the cross section of the inner side 321 of the handle body is a rectangle with a chamfer; wherein the chamfer is provided at an end of the shank inner side 321 remote from the shank outer side 322; the length of the right-angle side of the chamfer angle is gradually increased from the lower part of the inner side 321 of the handle body to the upper part of the inner side 321 of the handle body; the length of the right-angle side of the chamfer at the bottom of the inner side 321 of the handle body is 0-15 mm; or, the cross section of the handle body inner side 321 is a rectangle with round corners; wherein the fillet is disposed at an end of the handle inner side 321 away from the handle outer side 322; the radius of the fillet gradually increases from the lower part of the handle body inner side 321 to the upper part of the handle body inner side 321; the radius of the fillet at the bottom of the inner side 321 of the handle body is 0mm-15mm, so that the femoral handle is convenient to mount, the anti-rotation stability of the femoral handle is enhanced, the femoral handle is prevented from rotating and loosening due to the movement of a patient, and further other complications are avoided.
Hereinafter, a femoral stem with a chamfer on the inner side in the present exemplary embodiment will be further described.
In the embodiment, the length difference between the right-angle side of the chamfer at the top of the inner side 321 of the handle body (namely, at A-A) and the right-angle side of the chamfer at the bottom of the inner side 321 of the handle body (namely, at B-B) is 0.01mm-15mm, preferably 1mm, 5mm or 10 mm; assuming that the chamfer leg length at a-a is C1 and the chamfer leg length at B-B is C2, then C1-C2 is 0.01mm-15 mm;
or, the difference between the radius of the fillet at the top of the inner side 321 of the handle (i.e. at A-A) and the radius of the fillet at the bottom of the inner side 321 of the handle (i.e. at B-B) is 0.01mm-15mm, preferably 1mm, 5mm or 10 mm; assuming that the radius of the fillet at a-a is R1 and the radius of the fillet at B-B is R2, then R1-R2 are 0.01mm-15 mm.
In this embodiment, the chamfers are disposed on both sides of the end of the handle body inner side 321 away from the handle body outer side 322;
or, the rounded corners are arranged on both sides of the end part of the handle body inner side 321 far away from the handle body outer side 322.
In this embodiment, the angle of the chamfer (i.e. the angle between the hypotenuse and the cathetus of the chamfer) is 0.1 ° to 89.9 °, preferably 30 °, 45 ° or 60 °.
In this embodiment, an included angle α between a central axis of the neck portion 2 of the femoral stem and a central axis of the stem body 3 of the femoral stem (i.e., a shaft angle) is 125 ° to 145 °, and preferably 135 °.
In this embodiment, the surface of the femoral stem body 3 is coated with a titanium coating and/or a hydroxyapatite coating and/or a sand coating, preferably a titanium coating, which can enhance the biocompatibility of the femoral stem.
In a specific implementation, the femoral stem comprises a femoral stem taper 1, a femoral stem neck 2 and a femoral stem shank 3; the femoral stem body 3 comprises a stem body proximal end 31, a stem body middle section 32 and a stem body distal end 33 which are sequentially arranged from top to bottom; the femoral stem neck 2 is arranged on the top of the stem body proximal end 31; the femoral stem taper 1 is connected with the stem proximal end 31 through the femoral stem neck 2; the handle middle section 32 comprises a handle inner side 321 close to the inner side of the human femur and a handle outer side 322 opposite to the handle inner side 321; the cross section of the inner side 321 of the handle body is a rectangle with a chamfer; wherein the chamfers are arranged on two sides of the end part of the handle body inner side 321 far away from the handle body outer side 322; the angle of the chamfer is 45 degrees; the length of the right-angle side of the chamfer angle is gradually increased from the lower part of the inner side 321 of the handle body to the upper part of the inner side 321 of the handle body; the length of the right-angle side of the chamfer at the bottom of the inner side 321 of the handle body (namely at B-B) is 0mm, and the length of the right-angle side of the chamfer at the top of the inner side 321 of the handle body (namely at A-A) is 15 mm.
In another specific implementation, the femoral stem comprises a femoral stem taper 1, a femoral stem neck 2, and a femoral stem shaft 3; the femoral stem body 3 comprises a stem body proximal end 31, a stem body middle section 32 and a stem body distal end 33 which are sequentially arranged from top to bottom; the femoral stem neck 2 is arranged on the top of the stem body proximal end 31; the femoral stem taper 1 is connected with the stem proximal end 31 through the femoral stem neck 2; the handle middle section 32 comprises a handle inner side 321 close to the inner side of the human femur and a handle outer side 322 opposite to the handle inner side 321; the cross section of the inner side 321 of the handle body is a rectangle with a chamfer; wherein the chamfers are arranged on two sides of the end part of the handle body inner side 321 far away from the handle body outer side 322; the angle of the chamfer is 45 degrees; the length of the right-angle side of the chamfer angle is gradually increased from the lower part of the inner side 321 of the handle body to the upper part of the inner side 321 of the handle body; the length of the right-angle side of the chamfer at the bottom of the inner side 321 of the handle body (namely at B-B) is 5mm, and the length of the right-angle side of the chamfer at the top of the inner side 321 of the handle body (namely at A-A) is 20 mm.
In another specific implementation, the femoral stem comprises a femoral stem taper 1, a femoral stem neck 2, and a femoral stem shaft 3; the femoral stem body 3 comprises a stem body proximal end 31, a stem body middle section 32 and a stem body distal end 33 which are sequentially arranged from top to bottom; the femoral stem neck 2 is arranged on the top of the stem body proximal end 31; the femoral stem taper 1 is connected with the stem proximal end 31 through the femoral stem neck 2; the handle middle section 32 comprises a handle inner side 321 close to the inner side of the human femur and a handle outer side 322 opposite to the handle inner side 321; the cross section of the inner side 321 of the handle body is a rectangle with a chamfer; wherein the chamfers are arranged on two sides of the end part of the handle body inner side 321 far away from the handle body outer side 322; the angle of the chamfer is 45 degrees; the length of the right-angle side of the chamfer angle is gradually increased from the lower part of the inner side 321 of the handle body to the upper part of the inner side 321 of the handle body; the length of the right-angle side of the chamfer at the bottom of the inner side 321 of the handle body (namely at B-B) is 10mm, and the length of the right-angle side of the chamfer at the top of the inner side 321 of the handle body (namely at A-A) is 25 mm.
While preferred embodiments of the present application 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. Therefore, it is intended that the appended claims be interpreted as including the preferred embodiment and all such alterations and modifications as fall within the true scope of the embodiments of the application.
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 femoral stem with the chamfer at the inner side is introduced in detail, and the principle and the implementation mode of the femoral stem are explained by applying specific examples, and the description of the examples is only used for helping to understand the method and the core idea of the femoral stem; meanwhile, for a person skilled in the art, according to the idea of the present application, there may be variations in the specific embodiments and the application scope, and in summary, the content of the present specification should not be construed as a limitation to the present application.
Claims (6)
1. A femoral stem with a chamfer on the inner side is characterized by comprising: a femoral stem cone part, a femoral stem neck part and a femoral stem body;
the femoral stem handle body comprises a handle body proximal end, a handle body middle section and a handle body distal end which are sequentially arranged from top to bottom; the femoral stem neck is arranged at the top of the proximal end of the stem body; the femoral stem conical part is connected with the proximal end of the stem body through the femoral stem neck part; the middle section of the handle body comprises a handle body inner side close to the inner side of the human femur and a handle body outer side opposite to the handle body inner side;
the cross section of the inner side of the handle body is a rectangle with a chamfer; the chamfer is arranged at the end part of the inner side of the handle body, which is far away from the outer side of the handle body; the length of the right-angle side of the chamfer angle is gradually increased from the lower part of the inner side of the handle body to the upper part of the inner side of the handle body; the length of the right-angle edge of the chamfer at the bottom of the inner side of the handle body is 0-15 mm;
or the cross section of the inner side of the handle body is a rectangle with round corners; the fillet is arranged at the end part of the inner side of the handle body far away from the outer side of the handle body; the radius of the fillet is gradually increased from the lower part of the inner side of the handle body to the upper part of the inner side of the handle body; the radius of the fillet at the bottom of the inner side of the handle body is 0mm-15 mm.
2. The femoral stem according to claim 1, wherein the difference between the length of the right-angled side of the chamfer at the top of the inside of the stem and the length of the chamfer at the bottom of the inside of the stem is 0.01mm to 15 mm;
or the difference value of the radiuses of the round angle at the top of the inner side of the handle body and the round angle at the bottom of the inner side of the handle body is 0.01-15 mm.
3. The femoral stem according to claim 1, wherein the chamfer is provided on both sides of the end of the inner side of the stem body away from the outer side of the stem body;
or the fillets are arranged on two sides of the end part of the inner side of the handle body, which is far away from the outer side of the handle body.
4. The femoral stem of claim 1, wherein the angle of the chamfer is 0.1 ° -89.9 °.
5. The femoral stem according to claim 1, wherein the angle between the central axis of the neck of the femoral stem and the central axis of the stem body of the femoral stem is 125 ° to 145 °.
6. The femoral stem according to claim 1, wherein the surface of the stem body is coated with a titanium coating and/or a hydroxyapatite coating and/or a sand coating.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120296357.4U CN215019752U (en) | 2021-02-02 | 2021-02-02 | Femoral stem with chamfer at inner side |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120296357.4U CN215019752U (en) | 2021-02-02 | 2021-02-02 | Femoral stem with chamfer at inner side |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN215019752U true CN215019752U (en) | 2021-12-07 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202120296357.4U Active CN215019752U (en) | 2021-02-02 | 2021-02-02 | Femoral stem with chamfer at inner side |
Country Status (1)
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|---|---|
| CN (1) | CN215019752U (en) |
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2021
- 2021-02-02 CN CN202120296357.4U patent/CN215019752U/en active Active
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