Novel anti-sinking femoral stem
By designing an inverted round junction to prevent the overall downward sinking of the femoral stem from the overall sinking, the problem of Wagner Cone femoral stem misplaced in the prior art is solved, achieving higher anti-rotation stability and reducing the effect of secondary surgery.
Patent Information
- Application Number
- CN202420768792.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-04-15
- Publication Date
- 2025-03-04
- Estimated Expiration
- 2034-04-15
AI Technical Summary
The femoral stem of the Wagner Cone in the prior art is prone to sinking and dislocation after long-term use, resulting in incongruence of the hip joint, requiring secondary surgical treatment, and the patient is painful and lacks an effective solution.
A new type of anti-sinking femoral stem is designed, including a conical shank body, an inverted form of a circular table connection, a neck angle connection and an inclination connection. The design of the connecting portion of the round table ensures that the bottom of the handle body is not smaller than the top of the handle body, and the top is larger than the bottom of the handle body, thereby preventing the entire downward sinking of the handle body.
It effectively prevents the sinking and loss of the femoral stem, improves the anti-rotation stability and secondary stability of the stalk body part, reduces the need for secondary surgery, and has medical promotion value for patients.
Smart Images
Figure CN222549420U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of implantable prostheses, and in particular to a novel femoral stem for preventing sinking. Background Technology
[0002] Femoral stem replacement surgery in hip joint surgery requires the use of a femoral stem. Patients with small femoral medullary canals or congenital hip dysplasia require a special Wagner Cone prosthesis within the femoral stem. Current Wagner Cones generally include a stem body, a neck angle connector, and an angle connector. The stem body needs to be implanted into the femur. Because the stem body in current technology is usually a rough, conical shape with excessively long stem spines and body sections, long-term use can lead to femoral wear and stem body subsidence, making Wagner Cone dislocation very likely. Severe subsidence can cause serious limb incoordination, often requiring a second surgery, causing significant suffering for the patient. Currently, there is no corresponding solution to address these issues. Utility Model Content
[0003] The purpose of this invention is to overcome the shortcomings of the existing technology and provide a new type of femoral stem with a simple structure and a more reasonable design, which can effectively prevent the femoral stem from sinking and dislocation while improving anti-rotation stability.
[0004] The device includes a handle, a frustum connecting part, a neck angle connecting part, and an angle connecting part;
[0005] The handle is conical, and a frustum connecting part is integrally connected to the upper end of the handle; the upper end refers to the handle being an inverted cone or frustum shape during use, that is, an inverted state with the upper part larger than the lower part, and the upper end refers to the thicker end of the handle.
[0006] The frustum connecting part is inverted, with the lower part of the frustum connecting part not less than the upper part of the handle, and the upper part of the frustum connecting part being larger than its lower part; a neck angle connecting part and an inclined angle connecting part are integrally connected on the upper side of the frustum connecting part.
[0007] The effect achieved is that the frustum connecting part is a key component to prevent the femoral stem from sinking. That is, by setting the lower part of the frustum connecting part to be no smaller than the upper part of the stem body, and the upper part of the frustum connecting part to be larger than the lower part, the stem body, or the entire femoral stem, is prevented from sinking downward, that is, sinking into the femur.
[0008] The beneficial effects of this invention are: it solves the problem of femoral stem dislocation easily occurring with long-term use in the prior art. By adding a frustum-shaped connecting part, it can effectively prevent the stem body from settling and avoid overall femoral stem dislocation. Furthermore, it can improve the anti-rotation stability and secondary stability of the stem body, making it more valuable for medical application. Attached Figure Description
[0009] Figure 1 This is a schematic diagram of the structure of a novel anti-sinking femoral stem according to the present invention;
[0010] Figure 2 This utility model describes a novel anti-sinking femoral stem based on... Figure 1 A partial schematic diagram;
[0011] Figure 3 This is a cross-sectional view of the handle body.
[0012] Figure label:
[0013] 1-Handle body 11-Handle spine 2-Frustum connecting part 3-Angle connecting part 4-Neck angle connecting part
[0014] The realization of the purpose, functional features and advantages of this utility model will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation
[0015] Reference Figure 1 , Figure 2 and Figure 3 The present invention provides a novel anti-sinking femoral stem, comprising a stem body 1, a frustum connecting part 2, a neck angle connecting part 4, and an inclination angle connecting part 3.
[0016] The handle 1 is conical, and a frustum connecting part 2 is integrally connected to the upper end of the handle 1; the upper end refers to the handle 1 being an inverted cone or frustum form during use, that is, an inverted state with the upper part larger than the lower part, and the upper end refers to the thicker end of the handle 1.
[0017] The frustum connecting part 2 is in an inverted form, with the lower part of the frustum connecting part 2 not less than the upper part of the handle 1, and the upper part of the frustum connecting part 2 being larger than its lower part; the neck angle connecting part 4 and the tilt angle connecting part 3 are integrally connected on the upper side of the frustum connecting part 2.
[0018] Furthermore, the handle body 1 is provided with handle thorns 11, which are arranged in a uniform array around the handle body 1.
[0019] The aforementioned shank 11 is integrally connected to the shank body 1, and is in the form of a platform protruding outward, with the shank 11 being the same length as the shank body 1.
[0020] Preferably, the number of shank spines 11 is 4 to 8.
[0021] The effect achieved is that a bridge is formed between the stem 1 and the inner side of the cortical bone, which improves the antirotation stability of the stem 1 and the postoperative secondary stability.
[0022] In other words, compared to the existing Wagner Cone, the handle of this device is shorter, and a frustum connecting part is added to the upper part of the handle. It can also be said that, based on the existing Wagner Cone, the handle 11 part of this device is shorter, and the frustum connecting part 2 on it has no handle thorn design, thereby achieving the effect of preventing sinking.
[0023] Furthermore, the outer surface of the handle 1 is a rough titanium alloy surface or a rough diamond surface.
[0024] Furthermore, the outer surface of the frustum connecting part 2 is treated with titanium spraying or has a diamond rough surface, and its outer surface is either smooth or rough.
[0025] The effect achieved is to improve the corrosion resistance of the equipment.
[0026] Preferably, the handle 1 and the frustum connecting part 2 are made of titanium alloy and are coated with hydroxyapatite using a spraying process.
[0027] Furthermore, the included angle between the neck angle connecting part 4 and the frustum connecting part 2 includes two specifications: 125° and 135°.
[0028] In use, the stem 1 is implanted into the femur. The stem 1 with the stem spine 11 can form a bridge between the stem 1 and the inner side of the cortical bone, thereby improving the anti-rotation stability of the stem 1 and the postoperative secondary stability.
[0029] The arrangement of the lower part of the frustum connecting part 2 being no less than the upper part of the stem 1, and the upper part of the frustum connecting part 2 being greater than its lower part, can effectively prevent the stem 1, or the entire femoral stem, from sinking downwards, that is, sinking into the femur.
[0030] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. It will be apparent to those skilled in the art that this utility model is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or basic characteristics of this utility model. Therefore, the embodiments should be considered exemplary and non-limiting in all respects. The scope of this utility model is defined by the appended claims rather than the foregoing description, and thus all variations falling within the meaning and scope of equivalents of the claims are intended to be included within this utility model. No reference numerals in the claims should be construed as limiting the scope of the claims.
[0031] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.
Claims
1. A novel anti-sinking femoral stem, comprising a stem body, a truncated cone connection portion, a neck angle connection portion and an inclination angle connection portion, wherein the stem body is conical, and is characterized in that: A truncated cone connecting portion is integrally connected to the upper end of the handle body; The truncated cone connection part is inverted, the bottom of the truncated cone connection part is not smaller than the top of the handle body, and the top of the truncated cone connection part is larger than the bottom; the upper side of the truncated cone connection part is integrally connected, and a neck angle connection part and an inclination angle connection part are sequentially arranged.
2. The novel anti-sinking femoral stem according to claim 1, characterized in that: The handle body is provided with handle spines, which are arranged in a form of multiple spines arranged in a uniform array around the handle body; The handle spine is integrally connected with the handle body and is in the form of a platform protruding outwards, and the handle spine is the same length as the handle body.
3. The novel anti-sinking femoral stem according to claim 1, characterized in that: The outer surface of the handle body is a rough surface of titanium alloy.
4. The novel anti-sinking femoral stem according to claim 1, characterized in that: The outer surface of the truncated cone connection part is sprayed with titanium, and the outer surface is smooth or rough.
5. The novel anti-sinking femoral stem according to claim 1, characterized in that: The included angles between the neck angle connection portion and the truncated cone connection portion include two specifications: 125° and 135°.