CN213250060U - Bone cement LCP type femoral stem - Google Patents
Bone cement LCP type femoral stem Download PDFInfo
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- CN213250060U CN213250060U CN202021181236.7U CN202021181236U CN213250060U CN 213250060 U CN213250060 U CN 213250060U CN 202021181236 U CN202021181236 U CN 202021181236U CN 213250060 U CN213250060 U CN 213250060U
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Abstract
The utility model relates to a bone cement LCP type femoral stem, which comprises a conical head part, a neck part and a stem body which are connected in sequence, wherein the stem body comprises a stem body far end and a stem body near end, the cross section of the stem body near end is oval, and the stem body starts from the stem body near end to the stem body far end, and the arc of the cross section gradually shrinks and transitions to a trapezoid with smooth chamfer; the platform that blocks through setting up realizes preventing sunken effect, and can play the rotatory effect of prevention femoral stem through the handle body of injecing the shape, and above all, through the perfusion hole that blocks to set up on the platform, can pour into hollow handle internal portion with bone cement, then bone cement flows out the handle body through the through-hole with hollow handle body UNICOM, gets into inside the bone cavity, bone cement fills gap between handle body and the bone cavity wall, and then plays the effect of fixed femoral stem.
Description
Technical Field
The utility model relates to a hip joint replacement device field specifically is bone cement LCP type femoral stem.
Background
Hip joint replacement refers to the process of fixing a hip joint prosthesis on normal bone through bone cement, screws and the like to replace a diseased joint and reconstruct the normal function of the hip joint of a patient, wherein a femoral stem is used as an important part in the hip joint replacement, and the implanted effect directly influences the recovery degree of the joint function.
At present, the femoral stem is mainly grown by means of bone cells of a human body or an animal body and combined with the femoral stem to achieve the purpose of fixation, but the fixation effect of the existing femoral stem and a bone cavity after being implanted is not ideal, and the phenomena of sinking and rotating mainly exist, so that the short-term fixation effect and the long-term fixation effect of the existing femoral stem and the bone interface are not ideal.
In view of the above-mentioned drawbacks, the prior art makes several improvements, such as:
the Chinese patent invention CN110327138A discloses a femoral stem prosthesis, which comprises a stem body, a neck and a conical head which are connected in sequence from a far end to a near end and are in an integral structure, wherein the stem body comprises a near end part and a far end part, the near end part comprises a near end body and a function part connected between the near end of the near end body and the far end and close to one side of the neck, the near end body is connected with the far end part, the size of the function part is gradually increased from the far end of the near end body to the near end of the near end body, and the cross section of the function part connected with the near end body. The femoral stem prosthesis can be well matched with a narrow medullary cavity of a DDH patient, the occupied space of the neck part is small, the trauma to the femur is small, and the femur is not easy to sink and rotate;
also for example, chinese invention patent CN110384573A discloses a femoral stem for a hip implant and methods of design and manufacture thereof. A femoral stem for a hip implant, comprising: a femoral neck extending from a proximal end of the femoral stem toward a distal end of the femoral stem; an upper section connected to and extending from the femoral neck toward the distal end of the femoral stem, wherein the upper section comprises at least one proximal-distal solid rib flanking an open mesh; and a lower section connected to and extending from the upper section to the distal end of the femoral stem, wherein the lower section comprises a closed mesh encased in a solid skin; such femoral stems for hip implants are customized and manufactured using 3D printing techniques and provide a lightweight alternative to conventional implants.
However, the prior art only improves the appearance of the femoral stem, and although the sinking and rotating phenomena are reduced to a certain extent, because the combination tightness degree of the femoral stem and the bone cavity is not improved, the method of coating the coating on the surface of the femoral stem is still widely adopted, the requirements of faster growth of the bone at the combination part of the femoral stem, further enhancing the combination degree and avoiding the sinking and rotating are difficult to meet.
To the above problem, chinese utility model patent CN209790098U discloses a biological fixed femoral stem prosthesis, belongs to artifical hip joint technical field, biological fixed femoral stem prosthesis includes the handle body, the crisscross a plurality of horizontal fins and the vertical fin that is provided with in upper portion of the handle body, one of them vertical fin is convex, and with the inboard circular arc of the handle body is concentric. The utility model can increase the friction between the prosthesis and the bone by arranging the transverse convex ribs and the longitudinal convex ribs, improve the stability of the initial implantation of the prosthesis and prevent the prosthesis from sinking;
the mode of fixing by increasing the bulge at the outer side of the femoral stem improves the stability, but in the implantation process, the femoral stem needs to be implanted with more force, the pain of a patient is increased, and the femoral stem possibly damages the bone wall in the implantation process.
Therefore, how to improve the prior art to realize a femoral stem capable of simultaneously satisfying the prevention of the rotation subsidence of the prosthesis and the safety less injury becomes a problem to be solved.
SUMMERY OF THE UTILITY MODEL
The utility model aims to solve the technical problem that a bone cement LCP type femoral stem is provided to solve the defect that exists among the prior art.
The utility model provides an above-mentioned technical problem's technical scheme as follows:
the bone cement LCP type femoral stem comprises a conical head part, a neck part and a stem body which are sequentially connected, wherein the stem body comprises a stem body far end and a stem body near end, the cross section of the stem body near end is oval, the stem body starts from the stem body near end to the stem body far end, and the arc shape of the cross section of the stem body gradually shrinks and transits to a trapezoid with a smooth chamfer angle; the handle body is of a hollow structure, and an everted blocking platform for preventing the femoral handle from sinking is arranged at the joint of the handle body and the neck; the size of the blocking platform is larger than the size of the bone cavity; the hollow structure is communicated with a pouring hole on the blocking platform; the outer surface of the handle body is provided with a plurality of through holes communicated with the hollow structure;
further, the top of the distal end of the handle body is of a semi-spherical structure;
further, the inclination angle of the blocking platform relative to the horizontal line is 45 degrees; the included angle between the axis of the conical head part and the vertical line is 126 degrees;
furthermore, the cone head part, the neck part and the handle body of the femoral handle are integrally formed and made of cast cobalt-chromium-molybdenum alloy which meets YY0117.3 or ISO5832-4 standard;
further, the outer surface of the handle body is covered with a titanium and hydroxyapatite composite coating or a pure titanium coating;
the utility model has the advantages that: the platform that blocks through setting up realizes preventing sunken effect, and can play the rotatory effect of prevention femoral stem through the handle body of injecing the shape, and above all, through the perfusion hole that blocks to set up on the platform, can pour into hollow handle internal portion with bone cement, then bone cement flows out the handle body through the through-hole with hollow handle body UNICOM, gets into inside the bone cavity, bone cement fills gap between handle body and the bone cavity wall, and then plays the effect of fixed femoral stem.
Drawings
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a schematic plan view of the present invention;
FIG. 3 is a schematic view of the structure of the plane B-B of FIG. 2 according to the present invention;
FIG. 4 is a schematic view of the structure of the plane C-C of FIG. 2 according to the present invention;
the reference numerals are explained below:
1. the taper head part, 2, the neck part, 3, the handle body, 31, the handle body near end, 32, the handle body far end, 4, the blocking platform, 5, the perfusion hole, 6, the through hole, 7 and the hollow structure;
Detailed Description
The principles and features of the present invention are described below in conjunction with the following drawings, the examples given are only intended to illustrate the present invention and are not intended to limit the scope of the present invention.
As shown in fig. 1-4, the bone cement LCP type femoral stem includes a conical head 1, a neck 2, and a stem body 3 connected in sequence, wherein the stem body 3 includes a distal stem body end 32 and a proximal stem body end 31, the proximal stem body end has an elliptical cross section, and the stem body starts from the proximal stem body end to the distal stem body end, and the cross section of the stem body gradually shrinks and transitions to a trapezoid shape with a smooth chamfer; a blocking platform which is turned outwards and prevents the femoral stem from sinking is arranged at the joint of the stem body and the neck; the size of the blocking platform is larger than the size of the bone cavity; the handle body 3 is of a hollow structure, and the hollow structure is communicated with a pouring hole 5 on the blocking platform; the outer surface of the handle body 3 is provided with a plurality of through holes 6 communicated with a hollow structure 7;
when in operation, the femoral stem can be stapled into the bone cavity through the impactor, the injury to the bone cavity when the femoral stem is stapled by applying force is reduced because the distal end of the stem body is positioned in a semicircular structure, no bulge is arranged on the outer surface of the stem body, and chamfer processing is performed on corners, so that the surface is smooth, and the pain of a patient after the operation is further reduced;
more specifically, the top of the distal end of the handle body is a semi-spherical structure, as shown in fig. 2;
the femoral stem sinking prevention device is mainly realized by the aid of the blocking platform 4, and the rotation prevention is mainly realized by two technical means, one is that the stem body with a limited shape can prevent the femoral stem from rotating, most importantly, bone cement can be poured into the hollow stem body through the pouring hole formed in the blocking platform, then the bone cement flows out of the stem body through the through hole communicated with the hollow stem body and enters the bone cavity, and the bone cement fills a gap between the stem body and the wall of the bone cavity, so that the femoral stem fixing effect is realized;
because the femoral stem is arranged in the bone cavity, when the femoral stem is filled with bone cement, the femoral stem is tightly combined with the bone cavity, so that the bone cement is possibly not fully filled.
In one embodiment, as shown in FIG. 2, the blocking platform is angled at 45 to the horizontal; the included angle between the axis of the conical head part and the vertical line is 126 degrees; the angle can better adapt to the physiological structure of the hip joint, so that the stress of the hip joint prosthesis is more uniform, and the service life of the hip joint prosthesis is prolonged;
more specifically, the cone head part 1, the neck part 2 and the handle body 3 of the femoral stem are integrally formed and made of cast cobalt-chromium-molybdenum alloy which meets YY0117.3 or ISO5832-4 standard;
in another particular embodiment, the outer surface of the shank 3 is covered with a titanium and hydroxyphosphite composite coating or a pure titanium coating; the combination tightness between the bone and the femoral stem is further enhanced, and the fixing effect is enhanced;
the above description is only for the preferred embodiment of the present invention, and is not intended to limit the present invention, and any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention should be included within the protection scope of the present invention.
Claims (5)
1. Bone cement LCP type femoral stem, its characterized in that: the taper head part, the neck part and the handle body are sequentially connected, the handle body comprises a handle body far end and a handle body near end, the cross section of the handle body near end is oval, the handle body starts from the handle body near end to the handle body far end, and the arc shape of the cross section of the handle body gradually shrinks and transitions to a trapezoid with smooth chamfer angles; the handle body is of a hollow structure, and an everted blocking platform for preventing the femoral handle from sinking is arranged at the joint of the handle body and the neck; the size of the blocking platform is larger than the size of the bone cavity; the hollow structure is communicated with a pouring hole on the blocking platform; the outer surface of the handle body is provided with a plurality of through holes communicated with the hollow structure.
2. The bone cement LCP type femoral stem according to claim 1, wherein: the top of the distal end of the handle body is of a semi-spherical structure.
3. The bone cement LCP type femoral stem according to claim 2, wherein: the inclination angle of the blocking platform relative to the horizontal line is 45 degrees; the included angle between the axis of the conical head part and the vertical line is 126 degrees.
4. The bone cement LCP type femoral stem according to claim 3, wherein: the cone head part, the neck part and the handle body of the femoral handle are integrally formed and made of cast cobalt-chromium-molybdenum alloy which meets YY0117.3 or ISO5832-4 standard.
5. The bone cement LCP type femoral stem according to claim 4, wherein: the outer surface of the handle body is covered with a titanium and hydroxyapatite composite coating or a pure titanium coating.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021181236.7U CN213250060U (en) | 2020-06-23 | 2020-06-23 | Bone cement LCP type femoral stem |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021181236.7U CN213250060U (en) | 2020-06-23 | 2020-06-23 | Bone cement LCP type femoral stem |
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| Publication Number | Publication Date |
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| CN213250060U true CN213250060U (en) | 2021-05-25 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202021181236.7U Active CN213250060U (en) | 2020-06-23 | 2020-06-23 | Bone cement LCP type femoral stem |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113367852A (en) * | 2021-05-27 | 2021-09-10 | 北京力达康科技有限公司 | Small femoral stem prosthesis |
| CN116138932A (en) * | 2023-04-21 | 2023-05-23 | 北京纳通医疗科技控股有限公司 | Femoral stem and hip joint prosthesis with same |
-
2020
- 2020-06-23 CN CN202021181236.7U patent/CN213250060U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113367852A (en) * | 2021-05-27 | 2021-09-10 | 北京力达康科技有限公司 | Small femoral stem prosthesis |
| CN116138932A (en) * | 2023-04-21 | 2023-05-23 | 北京纳通医疗科技控股有限公司 | Femoral stem and hip joint prosthesis with same |
| CN116138932B (en) * | 2023-04-21 | 2023-08-04 | 北京纳通医疗科技控股有限公司 | Femoral stem and hip joint prosthesis with same |
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