Artificial hip joint prosthesis with artificial ischiatic muscle, iliofemoral ligament and matching anti-dislocation

Abstract

A new type of artificial sitting, iliofemoral ligament and matching anti-dislocation total hip joint prosthesis, including artificial ligament, acetabular cup, acetabular liner and artificial femoral head, the acetabular liner is sleeved with acetabular cup outside, the acetabular liner is a semispherical shape with a plane surface, the center of the plane surface is provided with an inwardly concave joint cavity, the artificial femoral head is inserted into the joint cavity with interference, constituting a movable structure, a plurality of outward ligament fixing holes are arranged on the periphery of the plane surface of the acetabular cup, a nail channel is arranged on the femoral stem of the artificial femoral head, the ligament sleeve ring of the artificial ligament is fixed in the ligament fixing hole through the fixing device, the tail line of the artificial ligament passes through the nail channel on the femoral stem and is fixed on the femoral stem through the locking nail, constituting an anti-dislocation structure; the present application has the advantages of simple structure, close to human physiological structure, low production cost, easy production and manufacturing, can prevent dislocation, solves the pain caused by prosthesis dislocation to patients and doctors, and has significant social and economic benefits.

Description

Technical Field

[0001] This invention relates to the field of prostheses, and in particular to an artificial isochord, iliofemoral ligament and matching anti-dislocation total hip joint prosthesis. Background Technology

[0002] Total hip arthroplasty has been widely used in clinical practice for decades. A typical total hip joint prosthesis consists of four parts: from the acetabular side to the femoral side, in order: the acetabular cup, the acetabular liner (which can be broadly categorized by material as metal, highly cross-linked polyethylene, and ceramic; polyethylene liners are being phased out), the artificial femoral head, and the femoral stem. However, this type of surgery has a very common complication: prosthesis dislocation. Due to weakened muscle strength and coordination, or poor patient compliance, such as those with Alzheimer's disease, hemiplegia, Parkinson's disease, or mental illness, it is difficult for them to follow the doctor's instructions for exercise or avoid certain high-risk movements. Alternatively, due to insufficient surgeon experience, dislocation is inevitable, sometimes even recurrent, causing severe pain. This seriously affects the surgical outcome, causes great suffering to patients and their families, and poses a long-term challenge to surgeons. Therefore, how to increase the stability of the prosthesis and minimize dislocation has become a pressing technical problem in clinical practice. Summary of the Invention

[0003] In view of the above situation and to overcome the shortcomings of the existing technology, the purpose of this invention is to use the principles of bionics to imitate the natural anti-dislocation mechanism of the human body and provide an artificial isochordinal femoral ligament, iliofemoral ligament and matching anti-dislocation total hip joint prosthesis, which can effectively solve the problem of artificial hip joint prosthesis dislocation.

[0004] To achieve the above objectives, the technical solution provided by this invention is an artificial isochordinal femoral ligament, an iliofemoral ligament, and a matching anti-dislocation total hip joint prosthesis, comprising an artificial ligament, an acetabular cup, an acetabular liner, and an artificial femoral head. The acetabular cup is fitted over the acetabular liner. The acetabular liner is a hemispherical shape with one flat side, and a concave joint socket is provided at the center of the flat side. The artificial femoral head extends into the joint socket with interference fit, forming a movable structure. The acetabular cup has multiple outward ligament fixation holes around its flat periphery. The femoral stem of the artificial femoral head has pin channels. The ligament collar of the artificial ligament is fixed in the ligament fixation holes by a fixation device. The tail of the artificial ligament passes through the pin channels on the femoral stem and is fixed to the femoral stem by locking pins, forming an anti-dislocation structure.

[0005] This invention has a simple structure that is closer to the physiological structure of the human body. It has low production costs, is easy to manufacture, can prevent dislocation, and solves the pain caused to patients and doctors by prosthesis dislocation, thus having significant social and economic benefits. Attached Figure Description

[0006] Figure 1This is a schematic diagram of the structure of the present invention (exploded view, i.e., a view showing the components separated).

[0007] Figure 2 This is a schematic diagram of the artificial ligament structure of the present invention.

[0008] Figure 3 This is a schematic diagram (partial cross-section) of the screw and tail pin structure of the present invention.

[0009] Figure 4 This is a schematic diagram (exploded view) of another embodiment of the present invention. Detailed Implementation

[0010] The specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings and specific circumstances.

[0011] As shown in the accompanying drawings, an artificial isochordinal and iliofemoral ligament and a matching anti-dislocation total hip joint prosthesis include an artificial ligament, an acetabular cup, an acetabular liner, and an artificial femoral head. The acetabular liner 1 is fitted with an acetabular cup 101. The acetabular liner 1 is a hemispherical shape with one flat side and an inwardly concave joint socket 11 at the center of the plane. The artificial femoral head 7 extends into the joint socket 11 through the interference fit, forming a movable structure. The acetabular cup 101 has multiple outwardly facing ligament fixation holes 2 around its plane. The femoral stem 702 of the artificial femoral head 7 has a pin channel 701. The ligament collar 10 of the artificial ligament 5 is fixed in the ligament fixation hole 2 by a fixation device. The tail 6 of the artificial ligament 5 passes through the pin channel 701 on the femoral stem 702 and is fixed to the femoral stem 702 by a locking pin 9, forming an anti-dislocation structure.

[0012] To ensure better implementation results, the artificial ligament 5 includes a ligament body 501, two ligament loops 10, and a tail line 6. The ligament body 501 is triangular in shape, with the apex of the triangle connected to the tail line 6 and the other two base corners connected to the two ligament loops 10. The ligament body 501 and the tail line 6 are woven from polyester fibers.

[0013] The ligament fixation hole 2 has 4 holes (not limited to 4, only 4 are shown in the figure), and the artificial ligament 5 has 2 holes. The ligament collars 10 on the two artificial ligaments 5 are staggered and fixed on the ligament fixation hole 2 to strengthen the strength between the artificial ligaments 5. The two artificial ligaments 5 can be exactly the same, or they can be made into two artificial ligaments 5 with different sizes and thicknesses according to the actual condition of the patient's hip joint.

[0014] The tail wire 6 is equipped with a guide pin 8 at its end.

[0015] The fixation device includes a screw 3 and a tail pin 4. One end of the screw 3 has an external thread corresponding to the internal thread of the ligament fixation hole 2, and the other end has an internal thread. The screw 3 is installed in the ligament fixation hole 2, and the ligament collar 10 is fitted onto the tail pin 4. The tail pin 4 extends into the screw 3 to fix the ligament collar 10 in the ligament fixation hole 2.

[0016] The fixation device is a tail pin 4, and a ligament collar 10 is fitted onto the tail pin 4. The tail pin 4 extends into the ligament fixation hole 2, fixing the ligament collar 10 into the ligament fixation hole 2.

[0017] The assembly configuration of this invention is as follows:

[0018] (1) First, place the acetabular cup 101 in the properly oriented acetabular socket and install the acetabular liner 1 inside it; on the femur, insert the femoral stem 702 of the artificial femoral head 7 into the properly oriented femoral medullary cavity, drill the pin channel corresponding to the ligament fixation hole 2 on the bone around the acetabulum, screw the screw 3 into the ligament fixation hole 2 and the pin channel, drill the hole in the bone covering the femoral stem 702 to correspond to the pin channel 701 on the femoral stem 702 for fixing the two artificial ligament tail lines 6;

[0019] (2) Place the ligament collar 10 of the artificial ligament 5 onto the tail screw 4, and then screw the tail screw 4 into the screw hole at the tail of the screw 3 to fix the ligament collar 10 in the ligament fixation hole 2. The four ligament collars 10 of the two artificial ligaments 5 are staggered and fixed in the ligament fixation hole 2, such as... Figure 1 and Figure 4 As shown, the strength between the two artificial ligaments 5 is enhanced;

[0020] (3) Using the guide pin 8, guide the two tail threads 6 through the two pin channels 701 on the femoral stem to reposition the artificial femoral head 7 into the joint socket 11 of the acetabular liner 1. Then adjust the tension of the two artificial ligaments 5 and screw the locking pin 9 into the pin channel 701 on the femoral stem to fix the tail thread 6 of the artificial ligament 5, preventing the artificial ligament 5 from separating from the femoral stem 702. Then cut off the excess tail thread 6 and tail guide pin 8. Connect the acetabular cup 101 to the femoral stem 702 through the artificial ligament 5, thereby further fixing the acetabular cup 101 and the artificial femoral head 7, restricting the movement of the artificial femoral head out of the acetabular cup, and preventing dislocation. The subsequent procedures are the same as in routine surgery and will not be described in detail here.

[0021] In practical use, the ligament collar 10 of the artificial ligament 5 can be directly put onto the tail nail 4, and then the tail nail 4 can be screwed into the ligament fixation hole 2 and the nail channel to achieve the purpose of fixing the ligament collar 10 in the ligament fixation hole 2. Other steps are the same as described above and will not be described one by one.

[0022] In practical use, the outer surfaces of the acetabular cup 101 and the femoral stem 702 are frosted, which makes it easier to fit better with the human body.

[0023] The working principle of this invention is based on recent research showing that the ligaments in the hip joint have the function of preventing femoral head dislocation. This structure is not present in various types of artificial hip joint prostheses or artificial femoral head prostheses. This invention utilizes bionics to reconstruct and mimic this structure in the artificial prosthesis. Normally, the artificial ischiofemoral and iliofemoral ligaments are located posterior to the artificial joint, not interfering with the free movement of the artificial femoral head, and are no different from previous artificial total hip joints. Only when the artificial femoral head exhibits abnormal movement and tends to dislocate posteriorly from the acetabulum, the artificial ischiofemoral and iliofemoral ligaments, while pulling on the femur, simultaneously confine the artificial femoral head within the acetabular cup, preventing posterior dislocation and thus avoiding dislocation.

[0024] The present invention has a simple structure and, compared with the prior art, has the following advantages:

[0025] (1) Compared with conventional artificial total hip joints, it is closer to the physiological structure of the human body, has more complete joint movement function and more complete anti-dislocation structure, which can prevent dislocation and solve the pain caused by prosthesis dislocation to patients and doctors.

[0026] (2) In terms of surgical operation, only three major steps have been added to the original surgery: artificial ligament placement, ligament connection of acetabular cup and femoral stem, and ligament locking. The learning curve is short and doctors who are used to routine joint replacement surgery can easily get started.

[0027] (3) In terms of product production and processing, the production cost is low, the production is easy, there are no excessive technical difficulties, the product is highly scalable, and it has significant social and economic benefits.

[0028] It should be noted that the above are merely preferred embodiments of the present invention and are not intended to limit the present invention in any way. Any modifications or alterations made by those skilled in the art without departing from the scope of the present invention to create equivalent embodiments based on the disclosed technical content shall fall within the protection scope of the present invention.

Claims

1. An artificial isochordinal femoral and iliofemoral ligament and a matching anti-dislocation total hip joint prosthesis, comprising an artificial ligament, an acetabular cup, an acetabular liner, and an artificial femoral head, wherein the acetabular liner (1) is fitted with an acetabular cup (101) on the outside, the acetabular liner (1) is a hemispherical shape with one side flat, and a concave joint socket (11) is provided at the center of the plane, and the artificial femoral head (7) extends into the joint socket (11) to form a movable structure, characterized in that, The acetabular cup (101) has multiple outward-facing ligament fixation holes (2) around its periphery. The femoral stem (702) of the artificial femoral head (7) has a pin channel (701). The ligament collar (10) of the artificial ligament (5) is fixed in the ligament fixation hole (2) by a fixation device. The fixation device includes a screw (3) and a tail screw (4). One end of the screw (3) has an external thread corresponding to the internal thread of the ligament fixation hole (2), and the other end has an internal thread. The screw (3) is installed in the ligament fixation hole (2), and the ligament collar (10) is fitted onto the tail screw (4). The tail screw (4) extends into the screw (3) to fix the ligament collar. The ring (10) is fixed in the ligament fixation hole (2); the artificial ligament (5) includes a ligament body (501), two ligament loops (10) and a tail line (6). The ligament body (501) is triangular, with the apex of the triangle connected to the tail line (6) and the other two bases connected to the two ligament loops (10); the tail line (6) of the artificial ligament (5) passes through the pin channel (701) on the femoral stem (702) and is fixed to the femoral stem (702) by the locking pin (9). The outer surfaces of the acetabular cup (101) and the femoral stem (702) are frosted, which is more conducive to better fit with the human body and form an anti-dislocation structure. 1) First, place the acetabular cup (101) in the prepared acetabular fossa at a suitable direction and position, and install the acetabular liner (1) inside it; on the femur, insert the femoral stem (702) of the artificial femoral head (7) into the prepared femoral medullary cavity, drill the pin track corresponding to the ligament fixation hole (2) on the bone around the acetabulum, screw the screw (3) into the ligament fixation hole (2) and the pin track, drill the hole in the bone covering the femoral stem (702) to correspond to the pin track (701) on the femoral stem (702) for fixing the two artificial ligament tail lines (6) 2) Place the ligament collar (10) of the artificial ligament (5) onto the tail nail (4), and then screw the tail nail (4) into the screw hole at the tail of the screw (3) to fix the ligament collar (10) in the ligament fixing hole (2). The four ligament collars (10) of the two artificial ligaments (5) are staggered and fixed in the ligament fixing hole (2) to strengthen the strength between the two artificial ligaments (5). 3) Using the guide pin (8), guide the two tail wires (6) through the two pin channels (701) on the femoral stem to reposition the artificial femoral head (7) into the joint socket (11) of the acetabular liner (1). Then adjust the tightness of the two artificial ligaments (5) and screw the locking pin (9) into the pin channel (701) on the femoral stem to fix the tail wire (6) of the artificial ligament (5) to prevent the artificial ligament (5) from separating from the femoral stem (702). Then cut off the excess tail wire (6) and tail guide pin (8). Connect the acetabular cup (101) and the femoral stem (702) through the artificial ligament (5) to further fix the acetabular cup (101) and the artificial femoral head (7), and restrict the movement of the artificial femoral head from sliding out of the acetabular cup. The ligaments on the hip joint have the function of preventing femoral head dislocation and avoiding the occurrence of dislocation.

2. The artificial isochoria, iliofemoral ligament, and matching anti-dislocation total hip joint prosthesis according to claim 1, characterized in that, The ligament fixation hole (2) is provided with 4 holes, and the artificial ligament (5) is provided with 2 holes. The ligament collars (10) on the two artificial ligaments (5) are staggered and fixed on the ligament fixation hole (2) to strengthen the strength between the artificial ligaments (5).

3. The artificial isochoria, iliofemoral ligament, and matching anti-dislocation total hip joint prosthesis according to claim 1, characterized in that, The fixation device is a tail pin (4), and the ligament collar (10) is fitted on the tail pin (4). The tail pin (4) extends into the ligament fixation hole (2) to fix the ligament collar (10) in the ligament fixation hole (2).

4. The artificial isochoria, iliofemoral ligament, and matching anti-dislocation total hip joint prosthesis according to claim 1, characterized in that, The tail wire (6) is equipped with a guide pin (8) at its end.

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