Novel anti-loosening femoral stem prosthesis

Abstract

The utility model relates to the field of femoral stem, in particular to a novel anti-loosening femoral stem prosthesis which comprises a stem body, a plurality of pressing devices are installed on the outer wall of the stem body and used for adjusting the expansion size of the stem body, a plurality of protrusions and a plurality of grooves are arranged on the outer wall of the stem body, and the protrusions and the grooves are arranged on the outer wall of the stem body. According to the utility model, the handle body is placed in a bone tube, the supporting part adopts smooth curved surface transition, so that the stress distribution is changed, the stress concentration is reduced, the prosthesis is not easy to sink and shift, the handle body is attached to the bone tube by utilizing a pressing device during installation, and the installation firmness of the handle body in the bone tube is increased; and meanwhile, under the action of the groove and the bulge, the contact area of the bone cement and the handle body is increased, so that the fastening performance of the handle body is further improved.

Description

Technical Field

[0001] The utility model relates to the field of femoral stems, in particular to a novel anti-loosening femoral stem prosthesis. Background Art

[0002] As we all know, the femoral stem is a medical surgical instrument. In recent years, artificial joint replacement surgery has gradually become an effective method commonly used in the medical community to treat joint-disabling diseases. The fixation effect between the femoral stem prosthesis implanted after surgery and the human body's natural thigh is the key to determining the service life and efficacy of the artificial joint.

[0003] At present, the femoral stem prosthesis on the market can generally be used for 8-15 years after surgery. With the increase of service life and frequency of use, the femoral stem prosthesis and the femoral medullary cavity will become loose due to osteoporosis and slight deformation of the femoral medullary cavity. When the degree of loosening is large, it will seriously affect the patient's normal life. At this time, only revision surgery can be performed, but revision surgery will cause secondary pain to the patient, as well as financial pressure. Utility Model Content

[0004] 1. Technical issues to be resolved

[0005] In view of the deficiencies of the prior art, the utility model provides a novel anti-loosening femoral stem prosthesis.

[0006] (II) Technical solution

[0007] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a new type of anti-loosening femoral stem prosthesis of the utility model includes a stem body, a plurality of clamping devices are installed on the outer wall of the stem body, the clamping devices are used to adjust the expansion size of the stem body, a plurality of protrusions and a plurality of grooves are provided on the outer wall of the stem body, a mounting rod is provided on the top of the stem body, the mounting rod is used to install the femoral head, a support part is provided at the bottom of the stem body, and the diameter of the support part is larger than the diameter of the stem body.

[0008] Preferably, the clamping device includes a bracket, a spring, an adjusting nut and a support plate, the support plate is installed on the outer wall of the adjusting nut, the bracket is fixedly installed on the outer wall of the handle body, a thread groove is provided in the bracket, the adjusting nut is connected to the thread groove through a thread structure, the spring is sleeved on the outside of the bracket, one end of the spring is fixed on the bracket, and the other end is connected to the adjusting nut.

[0009] Further preferably, the support plate is a circular structure.

[0010] Again preferably, the top of the support portion is an arc-shaped structure.

[0011] Preferably, a plurality of reinforcing ribs are provided on the outer wall of the support portion.

[0012] Further preferably, the surface of the support plate is provided with anti-slip grooves.

[0013] Again preferably, the reinforcing rib is provided with a plurality of convex patterns.

[0014] Preferably, the spring is made of any one of cobalt-chromium alloy, nickel-titanium alloy and stainless steel.

[0015] (III) Beneficial effects

[0016] Compared with the prior art, the utility model provides a novel anti-loosening femoral stem prosthesis, which has the following beneficial effects:

[0017] The utility model places the handle body into the bone canal, and the support part adopts a smooth curved surface transition, which changes the stress distribution, reduces stress concentration, and makes the prosthesis less likely to sink and shift. When installing, the handle body is fitted with the bone canal by a clamping device, which increases the firmness of the handle body in the bone canal. At the same time, under the action of the grooves and protrusions of the handle body, the contact area between the bone cement and the handle body is increased, thereby further improving the tightness of the handle body installation. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a front structural schematic diagram of the utility model;

[0019] Figure 2 This is a schematic diagram of the structure of the utility model when viewed from above;

[0020] Figure 3 This is a schematic diagram of the structure of the clamping device of the utility model;

[0021] In the figure: 1. handle body; 2. support part; 3. mounting rod; 4. groove; 5. protrusion; 6. bracket; 7. adjusting nut; 8. spring; 9. support plate; 10. reinforcing rib. DETAILED DESCRIPTION

[0022] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0023] See also Figure 1-3The utility model discloses a new type of anti-loosening femoral stem prosthesis, including a stem body 1, a plurality of clamping devices are installed on the outer wall of the stem body 1, and the clamping devices are used to adjust the expansion size of the stem body 1. The outer wall of the stem body 1 is provided with a plurality of protrusions 5 and a plurality of grooves 4. The top of the stem body 1 is provided with a mounting rod 3, and the mounting rod 3 is used to install the femoral head. The bottom of the stem body 1 is provided with a support part 2, and the diameter of the support part 2 is larger than the diameter of the stem body 1.

[0024] When the handle body 1 is installed in the bone tube, it needs to be expanded by a clamping device to fit tightly with the inner wall of the bone tube to ensure the firmness of the installation of the handle body 1 in the bone tube. The preferred scheme in the utility model is that the clamping device includes a bracket 6, a spring 8, an adjusting nut 7 and a support plate 9. The support plate 9 is installed on the outer wall of the adjusting nut 7. The bracket 6 is fixedly installed on the outer wall of the handle body 1. A threaded groove is provided in the bracket 6. The adjusting nut 7 is connected to the threaded groove through a threaded structure. The spring 8 is sleeved on the outer side of the bracket 6, and one end of the spring 8 is fixed to the bracket 6, and the other end is connected to the adjusting nut 7. The support plate 9 is a circular structure. According to the above structure, when the clamping device is used to fit with the inner wall of the bone tube, the adjusting nut 7 can be rotated. When the adjusting nut 7 is rotated, the spring 8 will be compressed or stretched, thereby achieving the compression or relaxation of the support plate 9. The anti-slip pattern structure on the support plate 9 improves the firmness of the fit with the inner wall of the bone tube.

[0025] In order to reduce stress concentration at the connection between the bottom of the handle body 1 and the bone tube, the preferred solution in the present invention is that the top of the support part 2 is an arc-shaped structure with a smooth curved surface transition, which changes the stress distribution and reduces stress concentration.

[0026] In order to increase the contact area between the support part 2 and the bone cement during installation, a preferred solution in the present invention is that a plurality of reinforcing ribs 10 are provided on the outer wall of the support part 2, and a plurality of convex patterns are provided on the reinforcing ribs 10.

[0027] In order to increase the applicability and service life of the spring 8, the spring 8 is made of any one of cobalt-chromium alloy, nickel-titanium alloy and stainless steel. Springs 8 of different materials can be selected according to the needs of different groups of people.

[0028] During use of the novel anti-loosening femoral stem prosthesis, the stem body 1 is placed into the bone canal, and the support part 2 adopts a smooth curved surface transition, which changes the stress distribution, reduces stress concentration, and makes the prosthesis less likely to sink and shift. When installing, the stem body 1 is fitted with the bone canal using a clamping device, which increases the firmness of the stem body 1 installed in the bone canal. At the same time, under the action of the groove 4 and the protrusion 5, the contact area between the bone cement and the stem body 1 is increased, thereby further improving the tightness of the installation of the stem body 1, enhancing the biocompatibility of the stem body 1, extending the service life of the stem body 1, improving the surgical effect, reducing the frequency of replacing the stem body 1, and improving clinical safety and effectiveness.

[0029] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A novel anti-loosening femoral stem prosthesis, characterized in that: The invention comprises a handle body (1), wherein a plurality of clamping devices are installed on the outer wall of the handle body (1), wherein the clamping devices are used to adjust the expansion size of the handle body (1), wherein a plurality of protrusions (5) and a plurality of grooves (4) are provided on the outer wall of the handle body (1), wherein a mounting rod (3) is provided on the top of the handle body (1), wherein the mounting rod (3) is used to mount the femoral head, and wherein a support portion (2) is provided on the bottom of the handle body (1), wherein the diameter of the support portion (2) is greater than the diameter of the handle body (1).

2. A novel anti-loosening femoral stem prosthesis according to claim 1, characterized in that: The clamping device comprises a bracket (6), a spring (8), an adjusting nut (7) and a support plate (9); the support plate (9) is mounted on the outer wall of the adjusting nut (7); the bracket (6) is fixedly mounted on the outer wall of the handle body (1); a thread groove is provided in the bracket (6); the adjusting nut (7) is connected to the thread groove via a thread structure; the spring (8) is sleeved on the outer side of the bracket (6); one end of the spring (8) is fixed to the bracket (6) and the other end is connected to the adjusting nut (7).

3. A novel anti-loosening femoral stem prosthesis according to claim 2, characterized in that: The support plate (9) is a circular structure.

4. A novel anti-loosening femoral stem prosthesis according to claim 3, characterized in that: The top of the support portion (2) is an arc-shaped structure.

5. A novel anti-loosening femoral stem prosthesis according to claim 4, characterized in that: A plurality of reinforcing ribs (10) are provided on the outer wall of the support portion (2).

6. A novel anti-loosening femoral stem prosthesis according to claim 5, characterized in that: The surface of the support plate (9) is provided with anti-slip grooves.

7. A novel anti-loosening femoral stem prosthesis according to claim 6, characterized in that: The reinforcing rib (10) is provided with a plurality of convex patterns.

8. The novel anti-loosening femoral stem prosthesis according to claim 7, characterized in that: The spring (8) is made of any one of cobalt-chromium alloy, nickel-titanium alloy and stainless steel.

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