CN212755996U

CN212755996U - Hip joint prosthesis with femoral head capable of being automatically reset

Info

Publication number: CN212755996U
Application number: CN202020508915.4U
Authority: CN
Inventors: 邱景生
Original assignee: Tianjin Corno Technology Co ltd
Current assignee: Tianjin Corno Technology Co ltd
Priority date: 2020-04-09
Filing date: 2020-04-09
Publication date: 2021-03-23
Anticipated expiration: 2030-04-09

Abstract

The utility model relates to a hip joint prosthesis with automatic femoral head reduction function, which comprises a femoral head cup, a femoral head lining, a femoral head bulb and a femoral stem which are sequentially sleeved, wherein the femoral head lining is of an eccentric structure. The eccentric amount is between 0.8mm and 3.2 mm. The utility model discloses make the motion function of double acting hip joint false body structure more stable, more reliable, improved patient's postoperative quality of life.

Description

Hip joint prosthesis with femoral head capable of being automatically reset

Technical Field

The utility model belongs to the field of medical equipment, a hip joint prosthesis, in particular to a hip joint prosthesis with femoral head capable of automatically resetting.

Background

The mobility of the artificial total hip joint prosthesis is a key index for completely or partially replacing the functions of the biological hip joint of the human body. The relevant standards specify: flexion/extension is not less than 100 °; abduction/adduction is not less than 60 degrees; internal/external rotation is not less than 90 ° (YY/T0920/ISO 21535). When the human body is in some non-standard postures, the abduction/adduction angle is far larger than the calibrated angle. Since the introduction of hip joint prostheses into clinical applications, the structures and functions of the prostheses approach physiological joints as much as possible in thousands of ways. In order to increase the mobility of the hip joint prosthesis, the inventor adopts a double-acting structure which comprises a double-acting half hip (shown in figure 1) and a double-acting full hip (shown in figure 2).

The double-acting hip joint prosthesis is a product of half hip or full hip, and an acetabulum component consisting of a double-acting acetabulum cup and a double-acting acetabulum liner completes the double-acting function. In actual use, the double-acting cup and the liner may sag due to improper movement of the patient and/or tendon relaxation (see fig. 3a and 3 b). It is serious that the double-acting parts are disassembled (see fig. 4).

SUMMERY OF THE UTILITY MODEL

The utility model aims to overcome the defects of the prior art, provide a hip joint prosthesis with automatic femoral head reduction, solve the functional defects of the double-acting cup of the double-acting hip joint prosthesis and the phenomenon of drooping caused by lining, and increase the reliability of the moving function of the total hip joint prosthesis.

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

a hip joint prosthesis with femoral head automatic reduction comprises a femoral head cup, a femoral head liner, a femoral ball head and a femoral stem which are sequentially sleeved, wherein the femoral head liner is of an eccentric structure.

Moreover, the center of the ball head clamping groove of the femoral head liner is eccentric along the femoral neck axial direction in the direction far away from the femoral head.

The eccentricity is between 0.8mm and 3.2mm, and the preferable eccentricity is between 1.5mm and 2.5 mm.

The hip joint prosthesis is a double-acting half hip joint prosthesis or a double-acting full hip joint prosthesis.

The reason for the phenomenon of the double-acting cup and the lining of the double-acting hip joint prosthesis dropping is that: the stress center of the joint prosthesis is at the center of the ball head, and the centers of the ball head, the lining and the double-acting cup are at one point. When the stress is balanced, the parts do ideal rotation motion around the central point. When an additional force is applied, the double acting component movement will deflect. The double-acting component is influenced by the gravity and deflects towards the gravity, so that the double-acting cup and the liner sag phenomenon are generated (see fig. 3a and 3 b).

The method for solving the problem of the double-acting cup and the liner sagging is to apply a counter force in the gravity direction to the double-acting member, and the counter force in the gravity direction can be generated by only generating the eccentricity of the double-acting liner or the double-acting cup.

The utility model has the advantages that:

the utility model discloses make the motion function of double acting hip joint false body structure more stable, more reliable, improved patient's postoperative quality of life.

Drawings

FIG. 1 is a view of a prior art double acting semi-hip prosthesis;

FIG. 2 is a view of a prior art double-acting total hip prosthesis;

FIG. 3a is a schematic view of the femoral head cup and liner droop of the double acting half hip joint prosthesis of FIG. 1;

FIG. 3b is a schematic view of the femoral head cup and liner droop of the double action total hip prosthesis of FIG. 2;

FIG. 4 is a schematic view of the femoral head cup and liner of the double acting half hip joint prosthesis of FIG. 1 shown removed;

FIG. 5 is a view of the double acting semi-hip prosthesis of the present invention;

figure 6 is a view of the structure of a double-acting total hip prosthesis according to the invention.

The reference numbers in the figures illustrate: 1 is a femoral head cup, 2 is a femoral head liner, 3 is a liner snap ring, 4 is a femoral head, 5 is a femoral stem, 6 is an acetabular cup, and 7 is an acetabular liner.

Detailed Description

The present invention will be described in further detail with reference to specific examples, which are provided for illustrative purposes only, and are not intended to be limiting, and the scope of the present invention should not be limited thereby.

Example 1

A double-acting half hip joint prosthesis with femoral head automatic reduction comprises a femoral head cup 1, a femoral head liner 2, a femoral ball head 4 and a femoral stem 5 which are sequentially sleeved. The innovation points are as follows: the femoral head liner 2 is made eccentric to the proximal end (the end closer to the heart) along the femoral neck axis (see fig. 5). Namely, the center of the ball head clamping groove of the femoral head liner 2 deviates along the femoral neck axial direction in the direction far away from the femoral head, and because the surface areas of the parts in various specifications, which are acted by the self weight and the body fluid viscosity, are different, the eccentricity of various specifications is between 1.5mm and 2.5 mm.

Example 2

A double-acting total hip joint prosthesis with automatic femoral head reduction comprises an acetabular cup 6, an acetabular liner 7, a femoral head cup 1, a femoral head liner 2, a femoral ball head 4 and a femoral stem 5 which are sequentially sleeved. The innovation points are as follows: the femoral head liner 2 is made to be eccentric proximally along the femoral neck axis (see fig. 6). Namely, the center of the ball head clamping groove of the femoral head liner 2 deviates along the femoral neck axial direction in the direction far away from the femoral head, and because the surface areas of the parts in various specifications, which are acted by the self weight and the body fluid viscosity, are different, the eccentricity of various specifications is between 1.5mm and 2.5 mm.

Because the specifications of the double-acting components are different in size and weight, the eccentric amount for generating the counter force in the gravity direction is also different in size correspondingly. The specification is 36-72 mm, and the minimum eccentricity is 0.8-3.2 mm through calculation. In the practical design, the safety factor and the numerical rounding are also increased, and the eccentric size of the final product is larger than the value of the minimum eccentric amount.

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. The utility model provides a hip joint prosthesis of femoral head automatic re-setting, includes the thighbone head cup that cup joints in proper order, femoral head lining, thighbone bulb, femoral stem, its characterized in that: the femoral head liner is of an eccentric structure, and the center of a ball head clamping groove of the femoral head liner is eccentric along the femoral neck axial direction in the direction far away from the femoral head.

2. The self-reducing hip prosthesis according to claim 1, wherein: the eccentric amount is between 0.8mm and 3.2 mm.

3. The self-reducing hip prosthesis according to claim 1, wherein: the hip joint prosthesis is a double-acting half hip joint prosthesis.

4. The self-reducing hip prosthesis according to claim 2, wherein: the hip joint prosthesis is a double-acting half hip joint prosthesis.

5. The self-reducing hip prosthesis according to claim 1, wherein: the hip joint prosthesis is a double-acting total hip joint prosthesis and comprises an acetabular cup, an acetabular liner, a femoral head cup, a femoral head liner, a femoral ball head and a femoral stem which are sequentially sleeved.

6. The self-reducing hip prosthesis according to claim 2, wherein: the hip joint prosthesis is a double-acting total hip joint prosthesis and comprises an acetabular cup, an acetabular liner, a femoral head cup, a femoral head liner, a femoral ball head and a femoral stem which are sequentially sleeved.