WO2021142686A1

WO2021142686A1 - Knee extension bridging apparatus for use in post-patellofemoral replacement revision

Info

Publication number: WO2021142686A1
Application number: PCT/CN2020/072370
Authority: WO
Inventors: 王波; 季卫平; 刘斌
Original assignee: 丽水市人民医院
Priority date: 2020-01-13
Filing date: 2020-01-16
Publication date: 2021-07-22

Abstract

A knee extension bridging apparatus for use in post-patellofemoral replacement revision, comprising an artificial patella (2) located between the femur (1) and the tibia of a knee joint. Tendons (3) wrap the exterior of the femur (1) and that of the tibia. The artificial patella (2) is fixedly connected at the upper and lower ends to one end of artificial tendons (4). The upper and lower artificial tendons (4) respectively are fixedly connected at the other end to the outside of the tendons (3). The artificial patella (2) is provided respectively at the upper and lower ends with sutures (5) used for connecting the artificial patella (2) to the artificial tendons (4). The upper side of the lower-end suture (5) is fixedly connected to the lower-end plane of the artificial patella (2). The lower side of the lower-end suture (5) fixedly connects the artificial tendons (4) to the tendons (3) by means of suturing. The upper and lower sutures (5) are symmetrically provided relative to the artificial patella (2).

Description

Knee extension bridging device for revision after patella replacement

Technical field

The invention relates to the field of patella replacement, in particular to a knee extension bridging device used for revision of severely comminuted fractures after patella replacement.

Background technique

Beginning in 2013, the number of aging population in my country will increase by 10 million, and it will double to exceed 400 million in the next 20 years. According to statistics, 51% of the elderly over 60 in my country suffer from knee osteoarthritis. In the United States, more than 9 million people have been diagnosed with knee arthritis through clinical symptoms and imaging data. In addition to traumatic arthritis and rheumatoid arthritis, a large number of elderly patients suffer from knee joint diseases. For elderly patients with knee joint disease in the middle and late stages, knee arthroplasty is an important treatment method. According to statistics, about 250,000 patients underwent artificial total knee arthroplasty in my country in 2018. As the number of knee joint replacements continues to increase, revisions have been made. Pathology is also increasing. There are a large number of prosthetic designs for the femur and tibia during revision knee joint surgery. It is a very serious problem for arthrologists to treat patients with comminuted patella fractures after knee replacement, especially after patella revision. In the prior art, only a large simple fracture of the patella can be repaired, and there is no treatment measure for the comminuted broken patella in the prior art.

Summary of the invention

The present invention aims to solve the above-mentioned problems in the prior art, and provides a knee extension bridge device for revision after patella replacement. The device has a reasonable structure design and is convenient to use, and can replace patients with severely comminuted fractures after patella replacement. Renovation, so that patients can lead a normal life.

The technical solution adopted by the present invention to solve its technical problems: This knee extension bridge device for revision after patella replacement includes an artificial patella located between the upper and lower femurs of the knee joint, the outer side of the femur is wrapped with a tendon, and the artificial The upper and lower ends of the patella are fixedly connected to one end of the artificial ligament, the other ends of the upper and lower artificial ligaments are respectively fixedly connected to the outside of the tendon, and the upper and lower ends of the artificial patella are respectively provided with sutures for connecting the artificial patella and the artificial ligament, The sutures at the lower end are fixedly connected to the lower end plane of the artificial patella, and the artificial ligaments and tendons are fixedly connected by sutures on the underside of the sutures at the lower end. The upper and lower sutures are arranged symmetrically with respect to the artificial patella and are provided for replacement. The artificial patella and the artificial ligament used to connect the artificial patella and the tendon, so that the replacement artificial patella can have the same role and function as its own patella in normal life, so that the patient can live a normal life after the patella replacement.

For further improvement, the artificial patella is provided with mounting grooves on the front sides of the upper and lower ends, the inner side of the artificial patella is wrapped with a connecting part, and the upper and lower sides of the front end of the connecting part are provided with several connecting posts, and the connecting posts pass through the artificial The patella is located inside the installation groove, one end of the artificial ligament is provided with a positioning hole located outside the connecting column, the artificial ligament is fixed inside the installation groove through the positioning hole, and the outside of the connecting column is threadedly connected There is an anti-loosening nut at the front end of the artificial ligament, and a connecting column for connecting the artificial ligament and the artificial patella, which makes the connection and fixation of the artificial ligament more convenient and firmer, and prevents the artificial ligament from being removed from the artificial patella during use. The upper part falls off, thereby affecting the normal life of the patient.

Further perfected, a channel hole located at the upper end of the lock nut is opened on the inner side of the upper end of the connecting column, one end of the suture passes through the channel hole and is fixed by a fixing thread knot, and is provided for fixing the suture on the artificial patella The lower end of the connecting column is arranged on the connecting part, so that when the suture is pulled, the pulling force is transmitted from the connecting column to the connecting part, so as to avoid damage to the surface of the artificial patella, thereby affecting the normal use of the artificial patella.

It is further perfected that the underside of the suture at the lower end is provided with a long suture for connecting the artificial ligament and the tendon. The long suture is provided to make the connection surface between the artificial ligament and the tendon lengthen and avoid the suture from the artificial ligament after long-term use. And tendons fall off, which affects the normal use of artificial patella.

To be further improved, there are several thread fixing devices fixedly connected to the artificial ligament on the outer side of the suture. The artificial ligament is provided with thread fixing devices, which can prevent the sutures from being entangled with each other when the device is in use. The device cannot be used normally.

In a further improvement, the thread fixing device includes an anti-dropping part located inside the artificial ligament, and the upper end of the anti-dropping part is fixedly connected with a connecting rod, and the connecting rod passes through the artificial ligament and is fixedly connected with a thread-fixing ring located outside the artificial ligament. The suture passes through the inner side of the thread-fixing ring and is provided with an anti-drop part located inside the artificial ligament, which can prevent the thread-fixing ring from detaching from the artificial ligament during use, thereby affecting the normal use of the device.

In a further improvement, a protective layer is fixedly connected to the inner side of the thread fixing ring, and the suture is located inside the protective layer and is provided with a protective layer, which can prevent the suture from rubbing and breaking with the thread fixing ring during use.

The beneficial effects of the present invention are that the structure of the present invention is reasonable in design and convenient to use. It is provided with an artificial patella for replacement and an artificial ligament for connecting the artificial patella and tendon, so that the replaced artificial patella can be with its own in normal life. The role and function of the patella are the same, so that the patient can live a normal life after patella replacement. It is provided with a connecting column for fixing the suture on the artificial patella. The lower end of the connecting column is set on the connecting part, so that when the suture is pulled, The tensile force is transmitted from the connecting column to the connecting part, thereby avoiding damage to the surface of the artificial patella.

Description of the drawings

Figure 1 is a schematic diagram of the structure of the present invention;

Figure 2 is a schematic diagram of the installation of the artificial patella and the artificial ligament;

Figure 3 is a cross-sectional view of Figure 2;

Figure 4 is an enlarged view of part C in Figure 3;

Fig. 5 is a schematic diagram of the structure of the fixing device.

Description of reference signs: 1, femur, 2, artificial patella, 3, tendon, 4, artificial ligament, 5, suture, 6, mounting groove, 7, connecting part, 8, connecting post, 9, positioning hole, 10, Medical locknut, 11, passage hole, 12, long suture thread, 13, thread fixing device, 14, anti-dropping part, 15, connecting rod, 16, thread fixing ring, 17, protective layer.

Detailed ways

The present invention will be further explained below in conjunction with the drawings:

As shown in Figure 1, a knee extension bridge device for revision after patella replacement in this embodiment includes an artificial patella 2 located between the upper and lower femurs 1 of the knee joint, and the outer side of the femur 1 is wrapped with a tendon 3, The upper and lower ends of the artificial patella 2 are fixedly connected to one end of the artificial ligament 4, the other ends of the upper and lower artificial ligaments 4 are respectively fixedly connected to the outside of the tendon 3, and the upper and lower ends of the artificial patella 2 are respectively provided for connecting artificial The suture 5 of the patella 2 and the artificial ligament 4, the upper side of the lower end of the suture 5 is fixedly connected to the lower end of the artificial patella 2, and the lower side of the lower end of the suture 5 is fixedly connected to the artificial ligament 4 and the tendon 3 by sutures The upper and lower sutures 5 are arranged symmetrically with respect to the artificial patella 2 and are provided with an artificial patella 2 for replacement and an artificial ligament 4 for connecting the artificial patella 2 and tendon 3, so that the artificial patella 2 after replacement can be used in normal life. The role and function of the patella is the same as that of the patella, so that the patient can live a normal life after patella replacement.

As shown in Figs. 2-4, the artificial patella 2 is provided with mounting grooves 6 on the front side of the upper and lower ends. The inner side of the artificial patella 2 is wrapped with a connecting portion 7, and the upper and lower sides of the front end of the connecting portion 7 are provided with several connecting posts 8 The connecting post 8 passes through the artificial patella 2 and is located inside the mounting groove 6, and one end of the artificial ligament 4 is opened with a positioning hole 9 located outside the connecting post 8, and the artificial ligament 4 passes The positioning hole 9 is fixed on the inner side of the mounting groove 6, the outer side of the connecting post 8 is threadedly connected with a lock nut 10 at the front end of the artificial ligament 4, and a connecting post 8 for connecting the artificial ligament 4 and the artificial patella 2 is provided, This makes the connection and fixation of the artificial ligament 4 more convenient and firmer, and prevents the artificial ligament 4 from falling off the artificial patella 2 during use, thereby affecting the normal life of the patient.

As shown in Figure 4, the inner side of the upper end of the connecting column 8 is opened with a passage hole 11 located at the upper end of the lock nut 10. One end of the suture 5 passes through the passage hole 11 and is fixed by a fixed thread knot. The suture 5 is fixed on the connecting post 8 of the artificial patella 2, and the lower end of the connecting post 8 is set on the connecting part 7, so that when the suture 5 is pulled, the pulling force is transmitted from the connecting post 8 to the connecting part 7, thereby avoiding the artificial patella 2 The surface is damaged, which affects the normal use of the artificial patella.

As shown in Figure 2, the lower side of the suture 5 at the lower end is provided with a long suture line 12 for connecting the artificial ligament 4 and the tendon 3. The long suture line is provided to make the connection surface between the artificial ligament and the tendon lengthen and avoid a long time. After use, the suture 5 falls off from the artificial ligament 4 and the tendon 3, thereby affecting the normal use of the artificial patella 2.

As shown in Figures 1-3, the suture 5 is provided with a number of fixing devices 13 fixedly connected to the artificial ligament 4, and the artificial ligament 4 is provided with a fixing device 13, which can prevent the device from being used during use. , The sutures 5 are entangled with each other, which causes the device to be unable to be used normally.

As shown in FIG. 5, the thread fixing device 13 includes an anti-dropping part 14 located inside the artificial ligament 4, and a connecting rod 15 is fixedly connected to the upper end of the anti-dropping part 14, and the connecting rod 15 passes through the artificial ligament 4 It is fixedly connected with a thread fixing ring 16 located on the outside of the artificial ligament 4, the suture 5 passes through the inner side of the thread fixing ring 16, and an anti-drop part 14 located on the inside of the artificial ligament 4 is provided, which can prevent the thread fixing ring 14 from being used When the artificial ligament 4 is detached from the artificial ligament 4, the normal use of the device is affected, and the fixing of the fixing ring 16 is more reliable.

As shown in FIG. 5, the inner side of the fixing ring 16 is fixedly connected with a protective layer 17. The suture 5 is located on the inner side of the protective layer 17 and is provided with a protective layer 17, which can prevent the suture 5 from being in contact with the fixing wire during use. The ring 16 is broken due to friction.

When the present invention is in use, only the artificial ligament 4 needs to be fixedly connected to the outside of the connecting column 8 through the positioning hole 9 and the medical locknut 10, and then one end of the suture 5 is fixed to the channel hole 11 on the connecting column 8 through a knot. Inside, the other end of the suture 5 is passed through the thread fixing device 13 in turn, and then the artificial ligament 4 and the tendon 3 are sutured and connected with a suture needle.

Although the present invention has been illustrated and described with reference to preferred embodiments, those of ordinary skill in the art should understand that various changes in form and details can be made within the scope of the claims.

Claims

A knee extension bridging device for revision after patella replacement, comprising an artificial patella (2) located between the upper and lower femurs (1) of the knee joint, and the outer side of the femur (1) is wrapped with a tendon (3), which is characterized by Yes: the upper and lower ends of the artificial patella (2) are fixedly connected to one end of the artificial ligament (4), the other ends of the upper and lower artificial ligaments (4) are respectively fixedly connected to the outside of the tendon (3), and the artificial patella (2) The upper and lower ends are respectively provided with sutures (5) for connecting the artificial patella (2) and the artificial ligament (4), and the upper side of the suture (5) at the lower end is fixedly connected to the lower end plane of the artificial patella (2) , The artificial ligament (4) and the tendon (3) are fixedly connected underneath the suture (5) at the lower end, and the upper and lower sutures (5) are symmetrically arranged with respect to the artificial patella (2).
A knee extension bridge device for revision after patella replacement according to claim 1, wherein the artificial patella (2) is provided with mounting grooves (6) on the front sides of the upper and lower ends, and the artificial patella (2) 2) A connecting part (7) is wrapped on the inner side. A number of connecting posts (8) are provided on the upper and lower sides of the front end of the connecting part (7). The connecting posts (8) pass through the artificial patella (2) and are located at the Inside the mounting groove (6), one end of the artificial ligament (4) is provided with a positioning hole (9) located outside the connecting column (8), and the artificial ligament (4) passes through the positioning hole (9) It is fixed on the inner side of the mounting groove (6), and the outer side of the connecting column (8) is screwed with a locknut (10) at the front end of the artificial ligament (4).
A knee extension bridge device for revision after patella replacement according to claim 2, characterized in that: the inner side of the upper end of the connecting column (8) is provided with a passage hole ( 11), one end of the suture (5) passes through the passage hole (11) and then is fixed by a fixed knot.
The knee extension bridging device for revision after patella replacement according to claim 1, characterized in that: the underside of the suture (5) at the lower end is provided for connecting the artificial ligament (4) and the tendon (3) The long suture (12).
A knee extension bridging device for revision after patella replacement according to claim 1, characterized in that: the suture (5) is provided with a plurality of fixed connections on the artificial ligament (4) on the outer side.线装置(13).
The knee extension bridging device for revision after patella replacement according to claim 5, characterized in that: the thread fixing device (13) comprises an anti-dropping part (14) located inside the artificial ligament (4) , The upper end of the anti-dropping part (14) is fixedly connected with a connecting rod (15), and the connecting rod (15) passes through the artificial ligament (4) and is fixedly connected with a fixing ring (16) located outside the artificial ligament (4) , The suture (5) passes through the inner side of the thread fixing ring (16).
The knee extension bridging device for revision after patella replacement according to claim 6, characterized in that: the inner side of the fixing ring (16) is fixedly connected with a protective layer (17), and the suture (5) Located inside the protective layer (17).