CN213758773U

CN213758773U - Femoral stem prosthesis with inclination angle

Info

Publication number: CN213758773U
Application number: CN202021345428.7U
Authority: CN
Inventors: 不公告发明人
Original assignee: Jingwei Medical Equipment Manufacturing Shenzhen Co ltd
Current assignee: Jingwei Medical Equipment Manufacturing Shenzhen Co ltd
Priority date: 2020-07-09
Filing date: 2020-07-09
Publication date: 2021-07-23
Anticipated expiration: 2030-07-09

Abstract

The utility model provides a femoral stem prosthesis with an inclination angle, which comprises a femoral cone, a femoral neck, a femoral stem shoulder and a femoral stem bottom which are connected in sequence; the femoral neck is equipped with first lateral wall and second lateral wall, first lateral wall with the second lateral wall sets up just relatively first lateral wall with the second lateral wall is and predetermines the angle, it is 2 degrees to 12 degrees to predetermine the angle. The femoral stem neck structure can increase the angular motion range of the femoral stem relative to the acetabular component under the cooperation of the small ball head on the premise of meeting the fatigue performance specified by the corresponding standard, and meets or even exceeds the requirement of the angular motion range between the femoral component and the acetabular component of the corresponding regulatory standard, particularly increases the angular motion range in the buckling and stretching directions.

Description

Femoral stem prosthesis with inclination angle

Technical Field

The utility model relates to the technical field of medical machinery, in particular to a femoral stem prosthesis with an inclination angle.

Background

In the medical field, artificial hip replacement is widely used as a clinical treatment method. The artificial hip joint replacement is mainly to implant artificial hip joint prosthesis into the position of the hip joint of a human body through a hip joint installation device, thereby achieving the purpose of eliminating the pain of a patient. The hip joint prosthesis is used for replacing a hip joint of a human body, and the operation process comprises the following steps: the femoral stem prosthesis is inserted into the femoral bone marrow cavity, the ball head is installed, and the acetabular cup is installed in the acetabulum, so that the function of the hip joint is realized. The neck structure of the prosthetic femoral stem has a great influence on the range of motion of the entire hip joint prosthesis system in addition to meeting the fatigue performance specified by the corresponding standards, and therefore the corresponding regulatory standards specify the range of angular motion between the femoral component and the acetabular component.

In the prior art, an eye-lens snake-shaped femoral stem prosthesis is disclosed, the femoral stem prosthesis comprises a femoral stem cone, a femoral neck and a stem body which are connected in sequence, the stem body comprises a femoral stem proximal section, a femoral stem middle section and a femoral stem distal section, the femoral stem cone is a cone-shaped body, one end of the femoral neck is connected with the femoral stem proximal section, a deflection angle is formed between the one end of the femoral neck and the femoral stem proximal section, the other end of the femoral neck is connected with a large-diameter end of the femoral stem cone, a plurality of rings of annular microgrooves are arranged on the surface of the femoral stem proximal section, and a plurality of longitudinal side wall ridge ridges extending longitudinally are arranged on the outer surface of the femoral stem distal section. The prosthesis adopts an integrated structure, so that the problems of abrasion, bone erosion and the like among components are solved; the femoral stem design meets the size of the femoral medullary cavity of more than 90 percent of patients; the anteversion angle of the invention is 0 degree to 35 degrees or 145 degrees to 180 degrees; and a Ti coating is sprayed on the outer surface of the proximal section of the femoral stem.

In the femoral stem prosthesis on the existing market, on the premise that the structure of the neck meets the fatigue performance specified by the corresponding standard, the situation that the neck of the femoral stem prosthesis collides with an acetabular component easily occurs in the movement relative to the acetabular component, so that the moving range of the whole hip joint prosthesis system is smaller, and even the moving range of the hip joint prosthesis system does not meet the requirements of the regulatory standard; or the fatigue performance of the neck structure is weakened under the requirement of meeting the corresponding moving range.

SUMMERY OF THE UTILITY MODEL

In view of the above, the present invention has been made in order to provide a femoral stem prosthesis with an inclination that overcomes or at least partially solves the above-mentioned problems.

In order to solve the problems, the utility model discloses a femoral stem prosthesis with an inclination angle, which comprises a femoral cone, a femoral neck, a femoral stem shoulder and a femoral stem bottom which are connected in sequence;

the femoral neck is equipped with first lateral wall and second lateral wall, first lateral wall with the second lateral wall sets up just relatively first lateral wall with the second lateral wall is and predetermines the angle, it is 2 degrees to 12 degrees to predetermine the angle.

Preferably, the angle between the femoral neck central axis and the femoral stem shoulder transverse axis is 135 degrees to 145 degrees.

Preferably, the angle formed by the central axis of the femoral neck and the central axis of the bottom of the femoral stem is 125-135 degrees.

Preferably, the bottom of the femoral stem is conical, and the conical shape is used for reducing the resistance of the femoral stem during implantation.

Preferably, the peripheral wall of the femoral stem shoulder is provided with a transverse groove for increasing the contact area with the bone.

Preferably, the peripheral wall of the bottom of the femoral stem is provided with a longitudinal groove for increasing the contact area with the bone.

Preferably, the femoral taper and the femoral neck are linearly connected.

Preferably, the femoral taper is conical.

Preferably, the outer surface of the bottom of the femoral stem is sprayed with a titanium coating or a hydroxyapatite coating or a sand coating.

Preferably, the outer surface of the shoulder of the femoral stem is sprayed with a titanium coating or a hydroxyapatite coating or a sand coating.

The utility model has the advantages that the femoral stem prosthesis with the inclination angle comprises a femoral cone, a femoral neck, a femoral stem shoulder and a femoral stem bottom which are connected in sequence; the femoral neck is equipped with first lateral wall and second lateral wall, first lateral wall with the second lateral wall sets up just relatively first lateral wall with the second lateral wall is and predetermines the angle, it is 2 degrees to 12 degrees to predetermine the angle. The femoral stem neck structure can increase the angular motion range of the femoral stem relative to the acetabular component under the cooperation of the small ball head on the premise of meeting the fatigue performance specified by the corresponding standard, and meets or even exceeds the requirement of the angular motion range between the femoral component and the acetabular component of the corresponding regulatory standard, particularly increases the angular motion range in the buckling and stretching directions.

Drawings

FIG. 1 is a schematic structural view of an embodiment of a femoral stem prosthesis with a dip angle according to the present invention;

FIG. 2 is a schematic cross-sectional view of the F-section of a femoral stem prosthesis with a dip angle according to the present invention;

fig. 3 is a schematic view of the range of motion of a femoral stem prosthesis with inclination angle according to the present invention.

1. A femoral awl; 2. a femoral neck; 21. a first side wall; 22. a second side wall; 3. a femoral stem shoulder; 4. the bottom of the femoral stem.

Detailed Description

In order to make the above objects, features and advantages of the present invention more comprehensible, the present invention is described in detail with reference to the accompanying drawings and the detailed description.

Referring to fig. 1 to 2, there are shown schematic structural views of a femoral stem prosthesis with an inclination angle according to the present invention, which may specifically include a femoral awl 1, a femoral neck 2, a femoral stem shoulder 3 and a femoral stem bottom 4 connected in sequence; the femoral neck 2 is provided with a first side wall 21 and a second side wall 22, the first side wall 21 and the second side wall 22 are oppositely arranged, the first side wall 21 and the second side wall 22 are at a preset angle, and the preset angle is 2 degrees to 12 degrees. The femoral stem neck structure can increase the angular motion range of the femoral stem relative to the acetabular component under the cooperation of the small ball head on the premise of meeting the fatigue performance specified by the corresponding standard, and meets or even exceeds the requirement of the angular motion range between the femoral component and the acetabular component of the corresponding regulatory standard, particularly increases the angular motion range in the buckling and stretching directions.

The angle formed by the central axis of the femoral neck 2 and the transverse axis of the femoral stem shoulder 3 is 135 degrees to 145 degrees, and the angle formed by the central axis of the femoral neck 2 and the transverse axis of the femoral stem shoulder 3 in the structural schematic diagram of fig. 1 is 140 degrees.

The angle between the central axis of the femoral neck 2 and the central axis of the femoral stem bottom 4 is 125 degrees to 135 degrees, and the angle between the central axis of the femoral neck 2 and the central axis of the femoral stem bottom 4 is 130 degrees in the structural schematic diagram of fig. 1.

The femoral stem bottom 4 is tapered for reducing resistance when the femoral stem is implanted.

The femoral awl 1 is linearly connected with the femoral neck 2, and the femoral awl 1 is in a conical shape.

The outer surface of the femoral stem bottom 4 is sprayed with a titanium coating or a hydroxyapatite coating or a sand coating, and the titanium coating is sprayed on the surface, so that the biocompatibility of the femoral stem prosthesis is enhanced.

The outer surface of the femoral stem shoulder part 3 is sprayed with a titanium coating or a hydroxyapatite coating or a sand coating, and the titanium coating is sprayed on the surface, so that the biocompatibility of the femoral stem prosthesis is enhanced.

Referring to fig. 3, showing the utility model discloses a femoral stem prosthesis's home range schematic with inclination, femoral stem prosthesis's home range is not restricted to the home range in this figure, and the structure of this application neck has increased especially the angular motion scope of increase bucking and extension direction, predetermines the design of angle through the neck to satisfy under the fatigue performance's that corresponding standard stipulated the prerequisite.

One of the core ideas of the utility model is that the femoral head comprises a femoral awl 1, a femoral neck 2, a femoral stem shoulder 3 and a femoral stem bottom 4 which are connected in sequence; the femoral neck 2 is provided with a first side wall 21 and a second side wall 22, the first side wall 21 and the second side wall 22 are oppositely arranged, the first side wall 21 and the second side wall 22 are at a preset angle, and the preset angle is 2 degrees to 12 degrees. The femoral stem neck structure can increase the angular motion range of the femoral stem relative to the acetabular component under the cooperation of the small ball head on the premise of meeting the fatigue performance specified by the corresponding standard, and meets or even exceeds the requirement of the angular motion range between the femoral component and the acetabular component of the corresponding regulatory standard, particularly increases the angular motion range in the buckling and stretching directions.

The femoral stem bottom part 4 is a cone, the cone is used for reducing the resistance when the femoral stem is implanted, and the cone is beneficial to the entering of the femoral stem prosthesis in the implantation process of the femoral stem prosthesis.

The peripheral wall of the femoral stem shoulder 3 is provided with a transverse groove for increasing the contact area with the bone. The transverse groove can increase the contact area of the femoral stem with the bone in the femoral medullary cavity, and can convert the annular pressure of the femoral stem originally formed in the medullary cavity into longitudinal pressure, so that the growth of the bone is better stimulated, and the femoral stem prosthesis is more stable and durable.

The 4 periphery walls in femoral stem bottom are equipped with the vertical slot that is used for the increase with bone area of contact, and vertical slot increase femoral stem false body is in the femoral medullary intracavity with the area of contact of bone, the stimulation bone growth to can effectively improve the dislocation problem in the use that the femoral stem leads to for the axial rotation of thighbone, make the femoral stem more stable durable.

The lowest part of the bottom 4 of the femoral stem is arranged to be spherical, so that the resistance of the femoral stem during implantation can be reduced, and the damage to a medullary cavity is reduced; effectively reducing the stress concentration problem at the bottom when the femoral stem is loaded and relieving the transition stimulation to the bone.

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 prosthesis with the dip angle provided by the present invention is introduced in detail, and the principle and the implementation of the present invention are explained by applying specific examples, and the description of the above embodiments is only used to help understanding the method and the core idea of the present invention; meanwhile, for the general technical personnel in the field, according to the idea of the present invention, there are changes in the specific implementation and application scope, to sum up, the content of the present specification should not be understood as the limitation of the present invention.

Claims

1. A femoral stem prosthesis with an inclination angle is characterized by comprising a femoral cone, a femoral neck, a femoral stem shoulder and a femoral stem bottom which are sequentially connected;

2. The femoral stem prosthesis of claim 1, wherein the angle between the femoral neck medial axis and the femoral stem shoulder transverse axis is from 135 degrees to 145 degrees.

3. The femoral stem prosthesis of claim 2, wherein the angle between the femoral neck central axis and the femoral stem base central axis is from 125 degrees to 135 degrees.

4. The femoral stem prosthesis of claim 1, wherein the femoral stem base is tapered to reduce resistance to femoral stem implantation.

5. The femoral stem prosthesis of claim 4, wherein the peripheral wall of the femoral stem shoulder is provided with a lateral groove for increasing the contact area with the bone.

6. The femoral stem prosthesis of claim 5, wherein the femoral stem base peripheral wall is provided with a longitudinal groove for increasing the area of contact with bone.

7. The femoral stem prosthesis of claim 6, wherein the femoral taper and the femoral neck are linearly connected.

8. The femoral stem prosthesis of claim 7, wherein the femoral taper is conical.

9. The femoral stem prosthesis according to claim 7, wherein the outer surface of the bottom of the femoral stem is coated with a titanium coating or a hydroxyapatite coating or a sand coating.

10. The femoral stem prosthesis according to any one of claims 1 to 9, wherein the outer surface of the femoral stem shoulder is coated with a titanium coating or a hydroxyapatite coating or a sand coating.