Joint spacer

Abstract

The utility model relates to a joint space occupying device which comprises a space occupying assembly and a supply device, and the supply device is arranged in the space occupying assembly in a sealed mode. The supply device comprises a liquid storage container and supply equipment; the liquid storage container is provided with a first liquid conveying opening, the occupying assembly is provided with a second liquid conveying opening, the first liquid conveying opening is communicated with the second liquid conveying opening through a liquid conveying pipe, and the supply equipment drives liquid in the liquid storage container to be discharged out of the occupying assembly through the liquid conveying pipe. Before installation is completed, the liquid storage container is filled with antibiotic medicine, after the occupied assembly is integrally installed in place, when medical staff need to give antibiotics to a patient, the medical staff only needs to control the supply equipment, the supply equipment drives liquid in the liquid storage container to flow out of the first infusion opening, and the liquid is discharged out of the occupied assembly from the second infusion opening through the infusion tube; the joint spacer can release antibiotics, the local effective drug concentration of a joint cavity part is maintained, drugs can be supplied according to actual needs, and the joint spacer has the advantage of being high in use flexibility.

Description

Technical Field

[0001] This utility model relates to the field of medical device technology, and in particular to a joint spacer. Background Technology

[0002] Orthopedic metal implants generally carry a risk of infection. The incidence of periprosthetic infection after joint replacement surgery is 1%-2%. In my country, over 1 million hip and knee replacement surgeries are performed annually, with over 10,000 cases of periprosthetic infection each year. Periprosthetic infection is the most difficult and catastrophic complication to manage after total joint replacement surgery. Its lengthy and recurring treatment cycle, persistently high mortality and recurrence rates, and enormous medical costs inflict severe physical and psychological trauma on patients and their families, while also placing a huge medical, economic, and social burden on society and the healthcare system. The related infection factors are complex (surgery-related and patient-related). Revision surgery for hip joint infection refers to revision surgery performed after hip replacement surgery due to periprosthetic infection. For periprosthetic infection, revision procedures include two-stage revision. Currently, two-stage revision is widely considered the "gold standard" for infection revision and is one of the most commonly used treatment methods.

[0003] The second-stage revision surgery refers to the procedure in which, after removing the original prosthesis and thoroughly cleaning the wound, a bone cement spacer is implanted and antibiotics are used systematically. After a period of infection control (usually 3 months), a second surgery is performed to remove the spacer and implant a new prosthesis.

[0004] The placement of a spacer requires the systemic use of antibiotics. While systemic administration of antibiotics can achieve the desired effect, antibiotics need to be metabolized by the liver and kidneys, resulting in significant overall side effects. Therefore, there is an urgent need for a joint spacer that can release antibiotics and increase the local antibiotic concentration in the joint cavity. Summary of the Invention

[0005] To address the aforementioned technical problems, this utility model provides a joint spacer that can supply medication according to actual needs, offering the advantage of high flexibility in use.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] A joint spacer includes a spacer assembly and a supply device, the supply device being sealed inside the spacer assembly;

[0008] The supply device includes a liquid storage container and a supply device; the liquid storage container is provided with a first inlet, and the occupant component is provided with a second inlet, the first inlet being connected to the second inlet via an inlet tube, and the supply device drives the liquid in the liquid storage container to be discharged from the occupant component through the inlet tube.

[0009] In one embodiment, the device further includes a controller and a sensing device, the controller being controlled to the supply equipment and the sensing device being electrically connected to the controller;

[0010] The controller controls the supply device to output the liquid from the storage container based on the sensing information from the sensing device.

[0011] In one embodiment, the sensing device includes a timer.

[0012] In one embodiment, the sensing device includes a communication module and a mobile terminal. The communication module is disposed inside the occupant component and is electrically connected to the controller. The communication module is also communicatively connected to the mobile terminal.

[0013] In one embodiment, the liquid storage container is provided with a piston pusher plate inside, and the supply device is a ball screw motor, which is connected to the piston pusher plate in a transmission manner.

[0014] In one embodiment, the occupant assembly is further provided with a three-way mixing container, wherein the first valve port of the mixing container is connected to the first infusion port, and the second valve port is connected to the infusion tube.

[0015] The occupant assembly also has a screw conveyor motor inside, which has a drug storage chamber. The output port of the drug storage chamber is connected to the third valve port of the mixing container.

[0016] In one embodiment, the second valve port is provided with a one-way valve to prevent liquid backflow into the three-way mixing container.

[0017] In one embodiment, the occupant assembly has a drainage cavity inside, and the infusion tube is connected to the drainage cavity;

[0018] The occupant component has multiple drainage holes on its exterior, and each drainage hole is connected to the drainage cavity.

[0019] In one embodiment, the placeholder component includes an outwardly protruding mounting protrusion.

[0020] In one embodiment, a power supply assembly for supplying power is also included, the power supply assembly being disposed inside the mounting protrusion.

[0021] This utility model has the following advantages due to the adoption of the above technical solution:

[0022] Before installation, antibiotics are filled into the reservoir. Once the spacer is fully installed, when medical staff need to administer antibiotics to the patient, they only need to control the supply device. The supply device drives the liquid in the reservoir to flow out from the first infusion port and out of the spacer through the infusion tube from the second infusion port. This allows the joint spacer to release antibiotics, maintain a local effective drug concentration in the joint cavity, and can supply drugs according to actual needs, offering the advantage of high flexibility in use. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the joint spacer in one embodiment of the present invention.

[0024] Figure 2 This is a schematic diagram of the internal structure of the joint spacer in one embodiment of the present invention;

[0025] Figure 3 This is a schematic diagram of the specific structure of the liquid storage container in one embodiment of the present invention;

[0026] The markings in the diagram are as follows:

[0027] 1. Placement component; 11. Second infusion port; 12. Mounting protrusion; 13. Drainage cavity; 14. Drainage hole;

[0028] 20. Liquid storage container; 201. First infusion port; 21. Supply equipment; 22. Infusion pipe; 23. Three-way mixing container; 24. Screw conveyor motor; 241. Drug storage bin; 242. Drive motor. Detailed Implementation

[0029] To make the objectives, technical solutions, and advantages of this utility model clearer, the technical solutions of this utility model are described clearly and completely below. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0030] Unless otherwise defined, the technical or scientific terms used in this invention shall have the ordinary meaning understood by one of ordinary skill in the art to which this invention pertains. The terms "first," "second," "third," "fourth," and similar words used in this invention do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Terms such as "comprising" or "including" mean that the element or object preceding the word encompasses the elements or objects listed following the word and their equivalents, without excluding other elements or objects. Terms such as "connected" or "linked" are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect.

[0031] Orthopedic metal implants generally carry a risk of infection. For periprosthetic infections, revision surgery includes two-stage revision. Currently, most people believe that two-stage revision is still the "gold standard" for infection revision and is one of the most commonly used treatment methods.

[0032] Second-stage revision surgery refers to the process of removing the original prosthesis, thoroughly cleaning the wound, implanting a bone cement spacer, and systematically administering antibiotics. While systemic antibiotic administration alone can achieve the desired effect, antibiotics are absorbed by the liver, resulting in significant overall side effects. Therefore, there is an urgent need for a joint spacer that can release antibiotics and maintain a local effective drug concentration in the joint cavity. To address the above technical problems, this invention provides a joint spacer that can supply medication according to actual needs, offering high flexibility in use. The technical solution of this invention will be described in detail below with specific examples.

[0033] Reference Figure 1 , Figure 2 as well as Figure 3 As shown, the present invention relates to a joint spacer, comprising a spacer component 1 and a supply device, the supply device being sealed inside the spacer component 1. The supply device includes a liquid storage container 20 and a supply device 21; the liquid storage container 20 is provided with a first inlet 201, and the spacer component 1 is provided with a second inlet 11, the first inlet 201 being connected to the second inlet 11 via an inlet tube 22, and the supply device 21 driving the liquid in the liquid storage container 20 to be discharged from the spacer component 1 through the inlet tube 22.

[0034] For example, before installation, antibiotics are filled into the reservoir 20. After the entire spacer component 1 is installed, when medical staff need to administer antibiotics to the patient, they only need to control the supply device 21. The supply device 21 drives the liquid in the reservoir 20 to flow out from the first infusion port 201 and out of the spacer component 1 from the second infusion port 11 through the infusion tube 22. This allows the joint spacer to release antibiotics, maintain the local effective drug concentration in the joint cavity, and supply drugs according to actual needs, which has the advantage of high flexibility in use.

[0035] In one embodiment, the joint spacer further includes a controller and a sensing device. The controller is controlled to the supply device 21, and the sensing device is electrically connected to the controller. The controller controls the supply device 21 to output liquid from the storage container 20 according to the sensing information of the sensing device.

[0036] Specifically, in this embodiment, the sensing device includes a timer. Medical staff can preset the time value through the timer and preset the output of the controller to the supply device 21 to realize the timed and quantitative output of liquid in the storage container 20.

[0037] In another embodiment, the sensing device includes a communication module and a mobile terminal. The communication module is disposed inside the placeholder component 1 and is electrically connected to the controller. The communication module is also communicatively connected to the mobile terminal.

[0038] Specifically, in this embodiment, the communication module is an NFC sensor, the mobile terminal is an NFC-enabled mobile phone, and the control signal is transmitted between the mobile terminal and the communication module via wireless electromagnetic coupling.

[0039] For example, when the joint spacer needs to release liquid from the reservoir 20, the user takes a mobile terminal close to the communication module. When the communication module recognizes the communication signal, the controller controls the supply device 21 to output the liquid from the reservoir 20. Medical personnel can also preset the activation time of the supply device 21 for each use to achieve a quantitative output each time. When the communication module recognizes the communication signal, it controls the supply device 21 to quantitatively output the liquid from the reservoir 20.

[0040] In one embodiment, the overall structure of the liquid storage container 20 and the supply device 21 is further refined. The liquid storage container 20 is provided with a piston pusher plate inside, and the supply device 21 is a ball screw motor, which is connected to the piston pusher plate in a transmission manner.

[0041] For example, when the controller controls the ball screw motor to rotate, the screw rotates, causing the nut component to slide linearly. Finally, the nut component drives the piston pusher plate to move linearly, causing the piston pusher plate to push the liquid in the liquid storage container 20 out of the first inlet 201. The controller presets the start time value of the ball screw motor, thereby controlling the number of rotations of the ball screw motor each time it starts, thus achieving the effect of quantitatively dispensing liquid from the liquid storage container 20. To provide isolation, a one-way valve is installed at the second inlet 11 to prevent liquid backflow into the occupant assembly 1.

[0042] In one embodiment, the spacer assembly 1 is further provided with a three-way mixing container 23, the first valve port of the mixing container being connected to the first infusion port 201, and the second valve port being connected to the infusion tube 22. The spacer assembly 1 is also provided with a screw conveyor motor 24, which has a drug storage chamber 241, and the output port of the drug storage chamber 241 being connected to the third valve port of the mixing container.

[0043] Considering that some powdered drugs need to be mixed with saline solution before use, a three-way mixing container 23 and a screw conveyor motor 24 are added inside the spacer component 1. The screw conveyor motor 24 consists of a drug storage chamber 241, a screw conveyor rod, and a drive motor 242. One end of the drug storage chamber 241 is the output port. The screw conveyor rod is installed inside the drug storage chamber 241 and is connected to the drive motor 242. The rotation of the drive motor 242 will drive the screw conveyor rod to rotate. Each rotation of the screw conveyor rod will push the powder in the drug storage chamber 241 out through the output port and into the mixing container, thereby achieving the function of conveying.

[0044] In addition, medical staff can also control the drive motor 242 to work with the screw conveyor to quantitatively output the medicine powder in the medicine storage chamber 241 into the mixing container when the communication module recognizes the communication signal by preset the start time of the drive motor 242.

[0045] For example, before installation, powdered medicine is filled into the inside of the drug storage chamber 241, and saline solution is filled into the liquid storage container 20. The start time of the drive motor 242 and the time for the controller to control the quantitative output of the supply device 21 once are preset. When the communication module recognizes the communication signal, the controller controls the drive motor 242 to drive the screw conveyor to quantitatively output the powder in the drug storage chamber 241 into the mixing container. Subsequently, the controller controls the supply device 21 to quantitatively output the liquid in the liquid storage container 20 into the mixing container. During the mixing process, the mixed liquid is simultaneously discharged from the placeholder component 1 through the infusion tube 22 and the second infusion port 11.

[0046] In this embodiment, a one-way valve is provided at the second valve port to prevent liquid backflow into the three-way mixing container 23.

[0047] In one embodiment, more preferably, the spacer assembly 1 is provided with a drainage cavity 13 inside, and the infusion tube 22 is connected to the drainage cavity 13. At the same time, a plurality of drainage holes 14 are provided on the outside of the spacer assembly 1, and each drainage hole 14 is connected to the drainage cavity 13.

[0048] With this structure, during the discharge process, the liquid can be gradually discharged from the spacer component 1 through multiple drainage holes 14, thereby improving the liquid penetration efficiency.

[0049] In one embodiment, the occupant component 1 includes an outwardly protruding mounting protrusion 12.

[0050] It should be noted that the installation protrusion 12 allows the spacer component 1 to be embedded in the bone, improving the overall installation stability.

[0051] More preferably, in this embodiment, a power supply component for power supply is also included, and in order to optimize the overall component layout, the power supply component is disposed inside the mounting protrusion 12.

[0052] In one extended embodiment, a measuring device is also included. The measuring device is disposed outside the occupant component 1 and integrates an acid-base sensor, a temperature sensor, and a pressure sensor. The measuring device is electrically connected to the controller. The measuring device can collect biological information near the occupant component 1 according to a preset timing plan and store the information data. External devices can read the data via NFC so that medical staff can understand the specific situation of the occupant component 1 in a timely manner and make adaptive adjustments according to the actual needs of the patient.

[0053] Before installation, antibiotic powder is filled into the drug reservoir 241, and saline or antibiotic solution is filled into the liquid reservoir 20. After the entire spacer component 1 is installed, when medical staff need to administer antibiotics to the patient, they only need to remotely control the supply device via NFC connection. The supply device drives the liquid in the liquid reservoir 20 to flow out from the first infusion port 201, flushing the antibiotic powder released from the drug reservoir 241, and then discharging it from the spacer component through the infusion tube 22. This allows the joint spacer to release antibiotics in the infected joint cavity, maintaining a local effective drug concentration in the joint cavity. The measuring device can further measure changes in temperature, pH, and pressure around the joint cavity, allowing medical staff to determine the medication to be administered based on actual needs. It has the advantages of high flexibility and accurate feedback.

[0054] Specifically, this utility model also provides three data transmission methods:

[0055] The first method involves an NFC coil as the communication module. The mobile terminal establishes a communication connection with the NFC coil via an NFC tag. This implementation also includes a power supply component. The measuring device collects biological information near the occupant component 1 according to a preset timing plan and stores the information data. External devices can read the data via NFC, allowing medical staff to promptly understand the specific situation of the occupant component 1 and subsequently make adaptive adjustments based on the patient's actual needs.

[0056] The second method involves an NFC coil as the communication module. The mobile terminal communicates and connects to the NFC coil via an NFC tag for power supply. In this implementation, the power supply component for the spacer is removed, further reducing the spacer's size. Specifically, the spacer is in a shutdown state when no mobile terminal is supplying power via the NFC tag. When the mobile terminal supplies power via the NFC tag, the measuring device collects biological information near the spacer 1, which is read by the mobile terminal via the NFC tag, allowing medical personnel to promptly understand the status of the spacer 1. Simultaneously, medical personnel can control the mobile terminal via the NFC tag for communication control. The controller controls the drive motor 242 to drive the screw conveyor to quantitatively output the powder from the drug storage chamber 241 into the mixing container. Subsequently, the controller controls the supply device 21 to quantitatively output the liquid from the liquid storage container 20 into the mixing container. During the mixing process, the mixed liquid is simultaneously discharged from the spacer 1 through the infusion tube 22 and the second infusion port 11.

[0057] The third type: The communication module is specifically a Bluetooth communication module. In this embodiment, a power supply component for power supply is also included. The measuring device can collect biological information near the occupant component 1 according to a preset timing plan and store the information data. External devices can read the data via Bluetooth communication, so that medical staff can understand the specific situation of the occupant component 1 in a timely manner, and subsequently make adaptive adjustments according to the actual needs of the patient.

[0058] This utility model also provides an application scenario;

[0059] To address periprosthetic infection after knee replacement surgery, femoral and tibial spacers are needed to create a mobile joint, allowing patients to walk with minimal weight-bearing during the implantation period. Therefore, spacers need to be installed on the femoral and tibial sides. For details, please refer to... Figure 1 As shown, Figure 1The upper part is the first spacer, and the lower part is the second spacer. The second spacer is specifically the spacer component 1 in this solution. The first spacer is specially designed according to the patient's femur. The second spacer on the tibial side can be installed on the proximal tibial plateau bone by antibiotic bone cement. The first spacer on the femoral side is installed on the distal femoral side bone by antibiotic bone cement. The femoral side and tibial side spacers form a movable joint.

[0060] Similarly, this spacer can also be used for periprosthetic infection after hip replacement surgery, and the design will be adjusted accordingly based on the surgical characteristics of hip replacement and the shape of the hip spacer.

[0061] In addition, the aforementioned spacer can also be used for periprosthetic infections, femoral shaft infections, tibia and fibula infections after shoulder replacement surgery, etc., simply by changing the shape of the spacer according to the anatomical characteristics of the surgical site.

[0062] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and not to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this utility model.

Claims

1. A joint spacer, characterized in that, It includes a spacer assembly and a supply device, wherein the supply device is sealed inside the spacer assembly; The supply device includes a liquid storage container and a supply device; the liquid storage container is provided with a first inlet, and the occupant component is provided with a second inlet, the first inlet being connected to the second inlet via an inlet tube, and the supply device drives the liquid in the liquid storage container to be discharged from the occupant component through the inlet tube.

2. The joint spacer according to claim 1, characterized in that, It also includes a controller and a sensing device, wherein the controller is controlled to the supply equipment and the sensing device is electrically connected to the controller; The controller controls the supply device to output the liquid from the storage container based on the sensing information from the sensing device.

3. The joint spacer according to claim 2, characterized in that, The sensing device includes a timer.

4. The joint spacer according to claim 2, characterized in that, The sensing device includes a communication module and a mobile terminal. The communication module is disposed inside the occupant component and is electrically connected to the controller. The communication module is also communicatively connected to the mobile terminal.

5. The joint spacer according to claim 2, characterized in that, The liquid storage container is equipped with a piston pusher plate inside, and the supply device is a ball screw motor, which is connected to the piston pusher plate in a transmission manner.

6. The joint spacer according to claim 2, characterized in that, The spacer assembly is also equipped with a three-way mixing container. The first valve port of the mixing container is connected to the first infusion port, and the second valve port is connected to the infusion tube. The occupant assembly also has a screw conveyor motor inside, which has a drug storage chamber. The output port of the drug storage chamber is connected to the third valve port of the mixing container.

7. The joint spacer according to claim 6, characterized in that, The second valve port is equipped with a one-way valve to prevent liquid backflow into the three-way mixing container.

8. The joint spacer according to claim 2, characterized in that, The occupant assembly has a drainage cavity inside, and the infusion tube is connected to the drainage cavity; The occupant component has multiple drainage holes on its exterior, and each drainage hole is connected to the drainage cavity.

9. The joint spacer according to claim 2, characterized in that, The placeholder component includes an outwardly protruding mounting protrusion.

10. The joint spacer according to claim 9, characterized in that, It also includes a power supply assembly for supplying power, the power supply assembly being disposed inside the mounting protrusion.

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