CN211409541U

CN211409541U - Hip joint femoral stem prosthesis for preventing dull thigh pain

Info

Publication number: CN211409541U
Application number: CN201921841581.6U
Authority: CN
Inventors: 邱景生
Original assignee: Tianjin Corno Technology Co ltd
Current assignee: Tianjin Corno Technology Co ltd
Priority date: 2019-10-30
Filing date: 2019-10-30
Publication date: 2020-09-04
Anticipated expiration: 2029-10-30

Abstract

The utility model relates to a hip joint femoral stem prosthesis for preventing blunt pain of thighs, wherein a longitudinal and a transverse elongated slot are arranged at the far end of a femoral stem. The composite groove structure can absorb the bending moment energy of the thighbone, thereby reducing the possibility of thigh pain of a patient after total hip prosthesis replacement, improving the life quality of the patient and prolonging the service life of the prosthesis.

Description

Hip joint femoral stem prosthesis for preventing dull thigh pain

Technical Field

The utility model belongs to the field of orthopedic medical instruments, and relates to a hip joint femoral stem prosthesis, in particular to a hip joint femoral stem prosthesis for preventing the pain of the thighs.

Background

Many patients have an unsightly dull pain in the replacement of the side thigh following a total hip prosthesis replacement. Less tolerable and more serious impacts on quality of life. This is an important issue that accompanies the development of total hip prosthesis replacement technology. Medical workers and medical device engineers have done a great deal of work in the replacement concept for prosthesis improvements in order to solve this problem. The substitution concept is skipped here. The improvement of the prosthesis is as follows: the far end of the femoral stem is made into a bullet head shape to reduce the compression on the cortical bone wall of the femoral medullary cavity (see figure 1); a groove with the length of about 20-40 mm and the width of 1mm is arranged at the far end of the femoral stem in the A/P direction or the M/L direction, so that the far end of the stem has elasticity in one direction and is only suitable for a round stem (see fig. 2a and 2 b). Both of these approaches have improved blunt pain following total hip prosthesis replacement, however, the results have not achieved the desired results. In the range of 0 +/-20 deg. or more in the direction parallel to the slot, the distal end of the stem cannot be elastically deformed to absorb energy and reduce the pressure of the bone wall.

The physiological hip joint of a human body is formed by an acetabulum formed by ilium, sitting and pubic concavity of a pelvic cavity and a femoral head at the upper end of a femur to form a movable joint, and the femur is abducted and adducted by pulling muscle; outward rotation and inward rotation; limited three-dimensional motion of flexion. The femur can generate bending force in any direction of the circumference, and the bending force is transmitted to the femoral stem to cause excessive compression on the femoral medullary cavity.

SUMMERY OF THE UTILITY MODEL

Through research and long-term clinical observation, the reason for the dull pain of thighs after the total hip prosthesis replacement is caused by the compression of the far end of the femoral stem on the cortical bone wall of the femoral medullary cavity. It is an object of the present invention to provide a hip femoral stem prosthesis that prevents blunt thigh pain, thereby eliminating and/or reducing blunt thigh pain after total hip prosthesis replacement surgery.

The utility model provides a technical scheme that technical problem adopted is:

a hip joint femoral stem prosthesis for preventing blunt thigh pain is characterized in that a longitudinal long groove and a transverse long groove are formed at the far end of a femoral stem.

And the longitudinal and transverse long grooves are communicated and form a T shape.

Moreover, the two ends of the longitudinal groove and the outer end of the transverse groove are positioned on the trisection point of the circumference of the distal end of the femoral stem.

Moreover, the length of the longitudinal and transverse long grooves is 1/3 of the total length of the hip joint femoral stem prosthesis.

And the width of the longitudinal and transverse long grooves is 1-2 mm.

The utility model has the advantages that:

the utility model discloses a violently indulge two T shape composite groove structures, can absorb thighbone bending moment energy to reduce patient's full hip prosthesis replacement back thigh painful possibility, improve patient's quality of life, the life of extension prosthesis.

Drawings

FIG. 1 shows the background art (the distal end of the femoral stem is made in the shape of a bullet);

FIG. 2a is background art (A/P directional grooving at the distal end of femoral stem);

FIG. 2b is background art (M/L directional grooving at the distal end of femoral stem);

FIG. 3 is a front view of the structure of the present invention;

FIG. 4 is a left side view of FIG. 3;

fig. 5 is a bottom view of fig. 3.

Detailed Description

The present invention will be described in further detail with reference to the following embodiments, which are illustrative, not restrictive, and the scope of the invention should not be limited thereto.

A hip joint femoral stem prosthesis for preventing blunt thigh pain is characterized in that a longitudinal long groove and a transverse long groove are formed in the far end of a femoral stem 1 and are communicated to form a T shape, as shown in figure 5, a transverse groove 3 is located on a transverse central line, the inner end of the transverse groove extends to the middle point of a longitudinal groove 2, the outer end of the transverse groove extends to the outer edge of the far end of the femoral stem, the two ends of the longitudinal groove extend to the outer edge of the far end of the femoral stem, and the two ends of the longitudinal groove and the outer end of the transverse groove are located on trisection points of the circumference of the far end of the femoral stem.

The length of the longitudinal and transverse long grooves is 1/3 of the total length of the hip joint femoral stem prosthesis. The width of the groove is 1-2 mm.

When the femur is subjected to bending force in any circumferential direction, the pressure angle to the distal end of the femoral stem is larger than 40 degrees, and the pressure angle is transmitted to the femoral stem, the distal end of the femoral stem generates elastic deformation, and the bending moment energy of the femur is absorbed, so that the compression of the femoral stem on the femoral medullary cavity is reduced, and the patient does not generate dull pain.

The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, many modifications and improvements can be made without departing from the spirit of the present invention, and these modifications and improvements are all within the protection scope of the present invention.

Claims

1. A hip femoral stem prosthesis for preventing dull thigh pain, comprising: two longitudinal and transverse elongated slots are arranged at the far end of the femoral stem.

2. The hip-femoral stem prosthesis for preventing dull thigh pain according to claim 1, wherein: the longitudinal and transverse long grooves are communicated and form a T shape.

3. The hip-femoral stem prosthesis for preventing dull thigh pain according to claim 1 or 2, characterized in that: the two ends of the longitudinal groove and the outer end of the transverse groove are positioned on the trisection points of the circumference of the distal end of the femoral stem.

4. The hip-femoral stem prosthesis for preventing dull thigh pain according to claim 1, wherein: the length of the longitudinal and transverse long grooves is 1/3 of the total length of the hip joint femoral stem prosthesis.

5. The hip-femoral stem prosthesis for preventing dull thigh pain according to claim 1, wherein: the width of the longitudinal long groove and the width of the transverse long groove are both 1-2 mm.