CN215307047U

CN215307047U - Hip joint spacer

Info

Publication number: CN215307047U
Application number: CN202120594828.XU
Authority: CN
Inventors: 曾建春; 曾意荣; 樊粤光; 李�杰; 冯文俊; 齐新宇; 陈锦伦
Original assignee: First Affiliated Hospital of Guangzhou University of Chinese Medicine
Current assignee: First Affiliated Hospital of Guangzhou University of Chinese Medicine
Priority date: 2021-03-24
Filing date: 2021-03-24
Publication date: 2021-12-28
Anticipated expiration: 2031-03-24

Abstract

The utility model relates to the technical field of medical instruments, in particular to a hip joint spacer. It includes the spacer head to and the thighbone stalk portion that links to each other with the spacer head, all is equipped with the ke shi needle in the inside of spacer head and thighbone stalk portion, and spacer head part is inlayer and the skin of parcel outside the inlayer, is equipped with the perforating hole on the skin, forms reservation channel, and the skin is through reservation channel and inlayer intercommunication. Compared with the prior art, the hip joint has the advantages that the internal and external double-layer structures are adopted, the reserved channel is formed, the internal layer and the external layer are made of different materials, the release time of antibiotics can be prolonged, the continuous high-concentration antibiotics in the hip joint can be maintained, the Kirschner wire is arranged in the hip joint, the mechanical strength is better than that of the existing product, the weight of a patient can be borne, and the walking ability of the patient can be supported.

Description

Hip joint spacer

Technical Field

The utility model relates to the technical field of medical instruments, in particular to a hip joint spacer.

Background

Deep infections after hip replacement are a catastrophic complication and once they occur, they are catastrophic to the patient. Through the continuous efforts of scholars at home and abroad, the treatment of infection is explored from first-stage revision to second-stage revision, and the artificial hip joint prosthesis is taken out in the first-stage operation and thoroughly debrided; the second surgery is a second surgery to be performed after infection control, at which time a new prosthesis is implanted. Clinical trials have shown that after debridement in the first stage of surgery, other objects should be used to occupy the space in the prosthesis, otherwise the soft tissues around the joint will contract, which will make the second stage of surgery difficult, and therefore the hip joint space occupying device will grow. Clinical verification shows that the hip joint spacer plays a remarkable role in treating the troublesome complication, and the second-phase revision surgery using the joint type antibiotic spacer is an internationally accepted method at present.

In the hip joint infection revision operation, usually, the previous joint prosthesis needs to be taken out firstly, a huge cavity which is consistent with the shape of the prosthesis is reserved in the joint at the moment, and some germs and infection substances are reserved around the cavity more or less, so that a doctor clinically usually holds a space occupying device by bone cement containing antibiotics with hands, the shape of the space occupying device is approximately the same as the shape of the cavity, and after the space occupying device is placed into the cavity, the open operation is finished, so that the purpose of controlling infection is achieved.

The existing hip joint spacer is mostly made of bone cement and is of an integral one-layer structure, the time for releasing antibiotics in the bone cement is short, the concentration of the antibiotics is reduced quickly, the high-concentration antibiotics in the hip joint cannot be kept for a long time, and meanwhile, the existing hip joint spacer cannot be used for walking with complete load and carrying load for a long time, and is easy to break to cause secondary injury to patients.

The utility model provides a hip joint spacer for solving the problems.

SUMMERY OF THE UTILITY MODEL

The hip joint spacer is integrally manufactured by adopting a mould, the spacer is regular in shape, a double-layer structure is adopted, the release time of antibiotics can be prolonged, high-concentration antibiotics in hip joints for a long time can be maintained, a Kirschner wire is adopted in the spacer as a framework, the mechanical strength of the spacer can be enhanced, the weight of a patient can be borne, and the daily walking function of the patient is ensured. To solve the problems mentioned in the background art.

In order to solve the above problems, the present invention provides the following technical solutions:

a hip joint spacer comprises a spacer head and a femoral stem connected with the spacer head, wherein Kirschner wires are arranged inside the spacer head and the femoral stem;

wherein, the spacer head divide into inlayer and parcel and is in the skin outside the inlayer be equipped with the perforating hole on the skin, the perforating hole is in form the reservation passageway in the skin, the skin passes through the reservation passageway with the inlayer intercommunication.

The hip joint spacer provided by the utility model also has the following technical characteristics:

further, the femoral stem part is composed of a proximal femur and a distal femur, and the diameter of the proximal femur is gradually reduced from the distal femur.

Further, the inner layer and the outer layer of the spacer head are both of spherical structures, and the diameter of the inner layer is at least 1 cm.

Further, the diameter of the reserve channel is smaller than the diameter of the inner layer.

Further, the outer layer is made of antibiotic bone cement materials, and the inner layer is made of antibiotic calcium sulfate materials.

Further, the kirschner wire is divided into a first kirschner wire and a second kirschner wire, the first kirschner wire and the second kirschner wire are respectively located on the inner side and the outer side of the interior of the hip joint spacer, the first kirschner wire and the second kirschner wire are located in the hip joint spacer and enclose a circle, and the diameter of the first kirschner wire and the diameter of the second kirschner wire are at least 3 mm.

Further, the hip joint spacer is integrally formed in the mold.

Furthermore, the number of the reserved channels is 4, and the reserved channels form a cross shape in the spacer head.

Compared with the prior art, the utility model has the beneficial effects that:

1) the head of the hip joint spacer is of a double-layer structure, the inner layer and the outer layer are made of different materials and are provided with reserved channels, the inner layer can be in contact with liquid in a hip joint cavity through the reserved channels, the inner layer is dissolved, the inner layer starts to release antibiotics after the outer layer releases the antibiotics for about one week, and the high concentration of the antibiotics in the hip joint can be effectively maintained;

2) the hip joint spacer is provided with a Kirschner wire, is placed in a product to serve as a skeleton, can simulate the structures of a tension bone trabecula and a pressure bone trabecula in the femoral head, bears pressure and tension, has better mechanical strength than the existing product, can bear the weight of a patient, and can maintain the walking capability of the patient.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without creative efforts.

FIG. 1 is a schematic view of the overall structure of a hip joint spacer according to the present invention;

FIG. 2 is a cross-sectional view of a hip spacer of the present invention;

figure 3 is a cross-sectional view of a hip spacer head of the present invention.

In the figure:

1-spacer head, 11-outer layer, 12-inner layer, 13-reserved channel, 2-femoral handle, 21 femoral proximal end, 22-femoral distal end, 3-kirschner wire, 31-first kirschner wire, 32-second kirschner wire.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.

In the description of the present invention, it should be noted that the terms "first", "second", and the like are used only for distinguishing the description, and are not intended to indicate or imply relative importance.

The utility model is discussed in detail below with reference to figures 1 to 3 and specific embodiments:

the utility model provides a hip joint spacer which comprises a spacer head 1 positioned at the top end of the hip joint spacer and a femur handle 2 connected with the spacer head 1, wherein the hip joint spacer is similar to an artificial hip joint prosthesis in appearance, and is used for taking out an original prosthesis in a human body to play the roles of spacer support and antibiotic release when a debridement position is infected around the hip joint prosthesis in the first period. The head 1 of the spacer and the inside of the femoral handle 2 are both provided with the kirschner wires 3, the kirschner wires 3 are used for simulating a tension bone trabecula and a pressure bone trabecula of a human body in the hip joint spacer of the embodiment, the effect of increasing the mechanical strength of the hip joint spacer is achieved, and after a patient is implanted into the hip joint spacer, the hip joint spacer can support the weight of the patient and can maintain the walking ability of the patient. In this embodiment, the placeholder head 1 is of a double-layer structure, the placeholder head 1 is divided into an inner layer 12 and an outer layer 11 wrapped outside the inner layer 12, the outer layer 11 is made of an antibiotic bone cement material, the material is made by mixing antibiotics and bone cement, the mixing ratio of the two materials, the type of the used antibiotics and the like are not particularly limited, and the placeholder head can be determined by the skilled person in the art according to the circumstances during manufacturing; the inner layer 12 is made of antibiotic calcium sulfate, the material is made by mixing calcium sulfate and antibiotic, the mixing ratio of the two materials and the type of the antibiotic are not limited specifically, and the inner layer can be determined by the person in the art according to the circumstances during the manufacturing process. The outer layer 11 is provided with a through hole, the through hole forms a reserved channel 13 in the outer layer 11, the outer layer 11 is communicated with the inner layer 12 through the reserved channel 13, the reserved channel 13 is only arranged in the outer layer 11, and the inner layer 12 is not communicated, namely, the inner layer 12 can be contacted with liquid in a hip joint cavity through the reserved channel 13. In one week when the hip joint spacer is implanted into a human body, the outer layer 11 firstly releases antibiotics, the inner layer 12 is contacted with liquid in a hip joint cavity of the human body through the reserved passage 13 and begins to dissolve after one week, so that the antibiotics contained in the inner layer 12 are released, the antibiotics released by the inner layer 12 are released into the hip joint cavity through the reserved passage 13, the continuous high-concentration antibiotic content in the hip joint is maintained, and the situation that the infection of a patient is caused because bacteria cannot be effectively killed due to too fast reduction of the antibiotic concentration is avoided.

The femur handle 2 is composed of a femur proximal end 21 and a femur distal end 22, the shape of the femur handle 2 is a shape simulating a hip joint prosthesis, and the diameters from the femur proximal end 21 to the femur distal end 22 are gradually reduced, so that the hip joint spacer can be implanted into a human body smoothly.

In this embodiment, the inner layer 12 and the outer layer 11 of the spacer head 1 are both spherical structures, the regular shape is beneficial to the smooth movement of the hip spacer after the hip spacer is implanted into a human body, and the discomfort of the patient caused by the hip spacer in the human body is avoided, so that the movement of the patient is not affected, the diameter of the inner layer 12 is at least 1cm, and the problem that the released antibiotics are insufficient due to the small size of the inner layer 12, so that bacteria cannot be thoroughly killed, and the high concentration of the antibiotics in the hip joint cavity is not sufficiently maintained is avoided.

The diameter of the reserved passage 13 is smaller than that of the inner layer 12, liquid in the hip joint cavity of the reserved passage 13 is in contact with the inner layer 12, so that the antibiotics on the inner layer 12 are dissolved and released after one week, and then the antibiotics are transferred into the hip joint cavity through the reserved passage 13 to kill bacteria.

The kirschner wire 3 is divided into a first kirschner wire 31 and a second kirschner wire 32, and the first kirschner wire 31 and the second kirschner wire 32 are positioned in the hip joint spacer and enclose a circle. First kirschner wire 31 with second kirschner wire 32 is located respectively the inside inboard and the outside of hip joint spacer for the structure of interior tension bone trabecula of femoral head and pressure bone trabecula bears patient's pressure and tension respectively, has enough high mechanical strength, is enough to bear patient's weight, can support patient's walking ability, first kirschner wire 31 with second kirschner wire diameter 32 is at least 3mm, and the effect that enough thick kirschner wire 3 can play the support as the skeleton.

Wherein, in this embodiment the hip joint spacer is mould integrated into one piece, has avoided the shape of the hip joint spacer of manual making irregular, and is inconvenient when implanting the human body, also takes place the occupy-place incompletely easily, and the problem of easy dislocation appears.

In this embodiment, the number of the reserve channels 13 is 4, and the reserve channels 13 form a cross shape in the spacer head 1.

When the hip joint spacer is manufactured, firstly, the internal structure 12 of the hip joint spacer is manufactured, calcium sulfate and antibiotics are mixed to manufacture a spherical structure of about 1cm, a Kirschner wire 3 with the thickness of 3mm is pre-bent and formed in a mould, the outer layer 11 is prepared by the antibiotics and bone cement, the antibiotics containing the bone cement are filled into the mould, the prepared Kirschner wire 3 framework and the inner layer 12 are placed, and the hip joint spacer with the double-layer structure is manufactured.

When a doctor carries out the hip joint infection revision operation, the doctor takes out the infected prosthesis in the original body, removes all residual foreign matters in the hip joint, thoroughly debrides the infected hip joint, and washes the acetabulum lateral bone surface and the femoral medullary cavity. The hip joint spacer is implanted into the hip joint of the human body.

The foregoing shows and describes the general principles, essential features, and advantages of the utility model. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are only preferred examples of the present invention and are not intended to limit the present invention, but that various changes and modifications may be made without departing from the spirit and scope of the utility model, which fall within the scope of the appended claims. The scope of the utility model is defined by the appended claims and equivalents thereof.

Claims

1. A hip joint spacer, characterized in that: the hip joint spacer comprises a spacer head and a femoral stem connected with the spacer head, and Kirschner wires are arranged inside the spacer head and the femoral stem;

2. The hip spacer of claim 1, wherein: the femoral stem part is composed of a proximal femur and a distal femur, and the diameter of the proximal femur gradually decreases from the distal femur.

3. The hip spacer of claim 1, wherein: the inner layer and the outer layer of the spacer head are both spherical structures, and the diameter of the inner layer is at least 1 cm.

4. The hip spacer of claim 3, wherein: the diameter of the reserve channel is smaller than the diameter of the inner layer.

5. The hip spacer of claim 1, wherein: the outer layer is made of antibiotic bone cement materials, and the inner layer is made of antibiotic calcium sulfate materials.

6. The hip spacer of claim 1, wherein: the kirschner wire is divided into a first kirschner wire and a second kirschner wire, the first kirschner wire and the second kirschner wire are respectively located on the inner side and the outer side of the interior of the hip joint spacer, the first kirschner wire and the second kirschner wire are located in the hip joint spacer and enclose a circle, and the diameter of the first kirschner wire and the diameter of the second kirschner wire are at least 3 mm.

7. The hip spacer of claim 1, wherein: the hip joint spacer is integrally formed in the die.

8. The hip spacer of claim 1, wherein: the number of the reserved channels is 4, and the reserved channels form a cross shape in the head of the spacer.