Joint spacer

Abstract

The invention 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] The present invention relates to the technical field of medical devices, and in particular to a joint spacer. Background Art

[0002] Orthopedic metal implants generally have infection risks. The incidence of periprosthetic infection in joint replacement is 1%-2%. The number of hip and knee replacement surgeries in my country exceeds 1 million per year, and the number of periprosthetic infections exceeds 10,000 per year. Periprosthetic infection is the most difficult and catastrophic complication to deal with after artificial joint replacement. Its long and repeated treatment cycle, high mortality rate and infection recurrence rate, as well as huge medical expenses, not only cause serious physical and psychological trauma to patients and their families, but also cause huge medical, economic, and social burdens to the entire society and health system. The related infection factors are complex (surgery-related and patient-related). Artificial hip joint infection revision surgery refers to revision surgery caused by periprosthetic infection after hip replacement. For periprosthetic infection, revision surgery includes two-stage revision. At present, most people believe that two-stage revision is still the "gold standard" for infection revision and is also one of the most commonly used treatment methods.

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

[0004] The implantation of a spacer requires the systemic use of antibiotics. Although simple systemic administration of antibiotics can achieve the desired effect, the antibiotics need to be metabolized by the liver and kidneys, and the overall side effects are large. 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] In view of the above technical problems, the present invention provides a joint spacer that can supply medicine according to actual needs and has the advantage of high flexibility in use.

[0006] To achieve the above object, the present invention adopts the following technical solutions: A joint spacer comprises a spacer assembly and a supply device, wherein the supply device is sealed and arranged inside the spacer assembly; The supply device includes a liquid storage container and a supply equipment; the liquid storage container is provided with a first infusion port, and the placeholder component is provided with a second infusion port, the first infusion port is connected to the second infusion port through an infusion tube, and the supply equipment drives the liquid in the liquid storage container to discharge the placeholder component through the infusion tube.

[0007] In one embodiment, it further includes a controller and a sensing device, wherein the controller is control-connected to the supply device, and the sensing device is electrically connected to the controller; The controller controls the supply device to output the liquid in the liquid storage container according to the sensing information of the sensing device.

[0008] In one embodiment, the sensing device includes a timer.

[0009] In one embodiment, the sensing device includes a communication module and a mobile terminal. The communication module is disposed inside the placeholder component and is electrically connected to the controller. The communication module is communicatively connected to the mobile terminal.

[0010] In one embodiment, a piston push plate is disposed inside the liquid storage container, and the supply device is a ball screw motor, which is transmission-connected to the piston push plate.

[0011] In one embodiment, a three-way mixing container is further disposed inside the placeholder component, wherein a first valve port of the mixing container is connected to the first infusion port, and a second valve port is connected to the infusion tube; A screw conveying motor is also provided inside the placeholder component. The screw conveying motor has a medicine storage bin, and the output port of the medicine storage bin is connected to the third valve port of the mixing container.

[0012] In one embodiment, the second valve port is provided with a one-way valve to prevent liquid from flowing back into the three-way mixing container.

[0013] In one embodiment, a drainage cavity is provided inside the space-occupying component, and the infusion tube is connected to the drainage cavity; A plurality of drainage holes are formed on the outside of the placeholder component, and each of the drainage holes is communicated with the drainage cavity.

[0014] In one embodiment, the placeholder assembly includes an outwardly convex mounting protrusion.

[0015] In one embodiment, a power supply component for supplying power is further included, and the power supply component is arranged inside the mounting protrusion.

[0016] The present invention adopts the above technical solution, which has the following advantages: Before completing the installation, fill the liquid storage container with antibiotics. After the placeholder component is installed as a whole, when medical staff need to give antibiotics to the patient, they only need to control the supply device. The supply device drives the liquid in the liquid storage container to flow out from the first infusion port and discharge the placeholder component from the second infusion port through the infusion tube, so that the joint placeholder can release antibiotics, maintain the local effective drug concentration in the joint cavity, and can supply drugs according to actual needs, with the advantage of high flexibility in use. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the specific structure of a joint spacer in one embodiment of the present invention; Figure 2 This is a schematic diagram of the internal structure of a joint spacer in one embodiment of the present invention; Figure 3 This is a schematic diagram of the specific structure of a liquid storage container in one embodiment of the present invention; The marks in the figure are as follows: 1. Placeholder component; 11. Second infusion port; 12. Mounting protrusion; 13. Drainage cavity; 14. Drainage hole; 20. Liquid storage container; 201. First infusion port; 21. Supply device; 22. Infusion tube; 23. Three-way mixing container; 24. Screw conveying motor; 241. Medicine storage bin; 242. Drive motor. DETAILED DESCRIPTION

[0018] In order to make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention is described clearly and completely below. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary persons in the art without creative work are within the scope of protection of the present invention.

[0019] Unless otherwise defined, the technical or scientific terms used in the present invention shall have the usual meanings understood by persons with ordinary skills in the field to which the present invention belongs. The words "first", "second", "third", "fourth" and similar terms used in the present invention do not indicate any order, quantity or importance, but are only used to distinguish different components. Words such as "include" or "comprise" and the like mean that the elements or objects appearing before the word include the elements or objects listed after the word and their equivalents, without excluding other elements or objects. Words such as "connect" or "connected" and the like are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect.

[0020] Orthopedic metal implants generally have the risk of infection. For periprosthetic infection, 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.

[0021] The second-stage revision refers to the implantation of a bone cement spacer and the systematic use of antibiotics after the removal of the original prosthesis and thorough debridement. Although simple systemic administration of antibiotics can achieve the desired effect, the antibiotics will be absorbed by the liver, and the overall side effects are large. Therefore, there is an urgent need for a joint spacer that can release antibiotics and maintain the local effective drug concentration in the joint cavity. In response to the above technical problems, the present invention provides a joint spacer that can supply drugs according to actual needs and has the advantage of high flexibility of use. The technical solution of the present invention is described in detail below in conjunction with specific examples.

[0022] Reference Figure 1 , Figure 2 as well as Figure 3 As shown, a joint spacer involved in the present invention comprises a spacer assembly 1 and a supply device, which is sealed inside the spacer assembly 1. The supply device comprises a liquid storage container 20 and a supply device 21; the liquid storage container 20 is provided with a first infusion port 201, the spacer assembly 1 is provided with a second infusion port 11, the first infusion port 201 is connected with the second infusion port 11 through an infusion tube 22, and the supply device 21 drives the liquid in the liquid storage container 20 to be discharged from the spacer assembly 1 through the infusion tube 22.

[0023] Illustratively, before completing the installation, antibiotic drugs are filled into the liquid storage container 20. After the placeholder component 1 is installed as a whole, when medical staff need to give antibiotics to the patient, they only need to control the supply device 21. The supply device 21 drives the liquid in the liquid storage container 20 to flow out from the first infusion port 201 and discharge the placeholder component 1 from the second infusion port 11 through the infusion tube 22, so that the joint placeholder can release antibiotics, maintain the local effective drug concentration in the joint cavity, and can supply drugs according to actual needs, with the advantage of high flexibility in use.

[0024] In one embodiment, the joint spacer further includes a controller and a sensing device. The controller is control-connected to the supply device 21 , and the sensing device is electrically connected to the controller. The controller controls the supply device 21 to output the liquid in the liquid storage container 20 according to the sensing information of the sensing device.

[0025] Specifically, in this embodiment, the sensing device specifically includes a timer. The medical staff pre-sets the time value through the timer and presets the output of the supply device 21 by the controller to achieve the timed and quantitative output of the liquid in the liquid storage container 20.

[0026] 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 the communication module is electrically connected to the controller, and the communication module is communicatively connected to the mobile terminal.

[0027] Specifically, in this embodiment, the communication module is specifically an NFC sensor, the mobile terminal is specifically an NFC-enabled mobile phone, and the control signal is transmitted between the mobile terminal and the communication module by wireless electromagnetic coupling.

[0028] For example, when the joint placeholder is required to release the liquid in the liquid storage container 20, the mobile terminal is brought close to the communication module, and when the communication module recognizes the communication signal, the controller controls the supply device 21 to output the liquid in the liquid storage container 20. Among them, medical staff can also preset the start time of the supply device 21 by the controller once, so as to achieve the effect of quantitative output each time. When the communication module recognizes the communication signal, it controls the supply device 21 to quantitatively output the liquid in the liquid storage container 20.

[0029] In one embodiment, the overall structure of the liquid storage container 20 and the supply device 21 is further refined, wherein a piston push plate is provided inside the liquid storage container 20, and the supply device 21 is a ball screw motor, which is transmission-connected to the piston push plate.

[0030] For example, when the controller controls the ball screw motor to rotate, the screw rotates, driving the nut component to slide linearly, and finally the nut component drives the piston push plate to move linearly, so that the piston push plate pushes the liquid in the liquid storage container 20 out of the first infusion port 201. Among them, the start time value of the ball screw motor is controlled by the preset controller, thereby controlling the number of rotations of the ball screw motor each time it starts, so as to achieve the effect of quantitatively pushing out the liquid storage container 20. Among them, in order to play an isolation role, a one-way valve is set at the second infusion port 11 to prevent the liquid from flowing back into the interior of the placeholder component 1.

[0031] In one embodiment, a three-way mixing container 23 is further disposed inside the placeholder component 1, the first valve port of the mixing container is connected to the first infusion port 201, and the second valve port is connected to the infusion tube 22. A screw conveying motor 24 is also disposed inside the placeholder component 1, and the screw conveying motor 24 has a medicine storage bin 241, and the output port of the medicine storage bin 241 is connected to the third valve port of the mixing container.

[0032] Considering that some powdered drugs need to be mixed with physiological saline before use, a three-way mixing container 23 and a screw conveying motor 24 are added inside the placeholder component 1. The screw conveying motor 24 is composed of a drug storage bin 241, a screw conveying rod and a driving motor 242, wherein one end of the drug storage bin 241 is an output port, the screw conveying rod is arranged inside the drug storage bin 241, and the screw conveying rod is connected to the driving motor 242 in a transmission manner. The rotation of the driving motor 242 will link the rotation of the screw conveying rod, and each rotation of the screw conveying rod can push the drug powder in the drug storage bin 241 through the output port and enter the mixing container, thereby realizing the function of conveying.

[0033] In addition, medical staff can also preset the start time of the drive motor 242. When the communication module recognizes the communication signal, it controls the drive motor 242 to link the spiral conveying rod to quantitatively output the powder in the medicine storage bin 241 into the mixing container.

[0034] Illustratively, before installation, powdered medicine is filled into the medicine storage bin 241, and physiological saline is filled into the liquid storage container 20, and the start time of the drive motor 242 and the single-time quantitative output time of the controller to control the supply device 21 are preset. When the communication module recognizes the communication signal, the controller controls the drive motor 242 to link the spiral conveying rod to quantitatively output the powder in the medicine storage bin 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 synchronously discharged from the placeholder component 1 through the infusion tube 22 and the second infusion port 11.

[0035] In this embodiment, a one-way valve is provided at the second valve port to prevent the liquid from flowing back into the three-way mixing container 23 .

[0036] In one embodiment, it is more preferred that a drainage cavity 13 is provided inside the placeholder component 1, and the infusion tube 22 is connected to the drainage cavity 13. At the same time, a plurality of drainage holes 14 are opened outside the placeholder component 1, and each drainage hole 14 is connected to the drainage cavity 13.

[0037] Through the arrangement of this structure, during the discharge process, the liquid can gradually be discharged from the placeholder component 1 through the multiple drainage holes 14, thereby improving the penetration efficiency of the liquid.

[0038] In one embodiment, the placeholder assembly 1 includes a mounting protrusion 12 that is convexly disposed.

[0039] It should be noted that the installation protrusion 12 enables the placeholder component 1 to be embedded and installed on the bone, thereby improving the overall installation stability.

[0040] More preferably, in this embodiment, a power supply component for powering power is also included. In order to optimize the overall component layout, the power supply component is disposed inside the mounting protrusion 12 .

[0041] In an extended embodiment, a measuring device is further included. The measuring device is arranged outside the placeholder component 1. The measuring device 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 placeholder component 1 according to a preset timing plan and store the information data. The external device can read it via NFC so that medical staff can understand the specific situation of the placeholder component 1 in time, which is convenient for medical staff to make adaptive adjustments according to the actual needs of the patient.

[0042] Before completing the installation, antibiotic powder is filled into the drug storage bin 241, and physiological saline or antibiotic solution is filled into the liquid storage container 20. After the placeholder component 1 is installed as a whole, when medical staff need to give antibiotics to patients, they only need to remotely control the supply device through NFC connection in vitro. The supply device drives the liquid in the liquid storage container 20 to flow out from the first infusion port 201, flushing the antibiotic powder released from the drug storage bin 241, and discharge the placeholder component through the infusion tube 22, so that the joint placeholder can release antibiotics in the infected joint cavity and maintain the local effective drug concentration in the joint cavity. The measuring device can further measure the changes in the temperature, pH value, pressure and other conditions around the joint cavity, so that medical staff can decide to supply drugs based on actual needs. It has the advantages of high flexibility in use and accurate feedback.

[0043] Specifically, the present invention also provides three data transmission modes: The first type: the communication module is specifically an NFC coil, and the mobile terminal realizes communication connection with the NFC coil through the NFC tag. In this embodiment, a power supply component for power supply is also included. The measuring device can collect biological information near the placeholder component 1 according to a preset timing plan and store the information data. The external device can read it through NFC, so that the medical staff can timely understand the specific situation of the placeholder component 1, and then facilitate the medical staff to make adaptive adjustments according to the actual needs of the patient.

[0044] The second type: the communication module is specifically an NFC coil, and the mobile terminal communicates and powers the NFC coil through the NFC tag. In this embodiment, the placeholder component is minus the power supply component for power supply to further reduce the placeholder volume. Specifically, when there is no mobile terminal to power through the NFC tag, the placeholder component is in a shutdown state as a whole. When the mobile terminal is powered through the NFC tag, the measuring device collects biological information near the placeholder component 1, and the mobile terminal reads through the NFC tag so that the medical staff can timely understand the specific situation of the placeholder component 1. At the same time, the medical staff can also control the mobile terminal to communicate through the NFC tag according to the actual situation. The controller controls the drive motor 242 to link the spiral conveying rod to quantitatively output the powder in the drug storage bin 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.

[0045] The third type: the communication module is specifically a Bluetooth communication module, and in this embodiment, a power supply component for power supply is also included. The measuring device can collect biological information near the placeholder component 1 according to a preset timing plan and store the information data, which can be read by an external device through Bluetooth communication, so that medical staff can understand the specific situation of the placeholder component 1 in time, and then make it convenient for medical staff to make adaptive adjustments according to the actual needs of the patient.

[0046] The present invention also provides an application scenario; For periprosthetic infection after knee replacement, spacers on the femoral and tibial sides are needed to form a movable joint, which can meet the patient's need to walk with a small amount of weight during the implantation of the spacer. Therefore, spacers need to be installed on the femoral and tibial sides. Figure 1 As shown, Figure 1 The upper part is the first placeholder, and the lower part is the second placeholder, and the second placeholder is specifically the placeholder component 1 in this solution. The first placeholder is specially designed according to the patient's femur, and the second placeholder on the tibial side can be installed on the proximal tibial plateau bone of the tibia by means of antibiotic bone cement. The first placeholder on the femoral side is installed on the distal femoral bone of the femur by means of antibiotic bone cement, and the femoral and tibial placeholders form a movable joint.

[0047] Similarly, the spacer can also be used to treat periprosthetic infection after hip replacement surgery, and corresponding design adjustments will be made based on the surgical characteristics of hip replacement surgery and the morphology of the hip spacer.

[0048] In addition, the above-mentioned spacer can also be used for periprosthetic infection after shoulder replacement surgery, infection of the femoral shaft, tibia and fibula, etc., by simply changing the shape of the spacer according to the anatomical characteristics of the surgical site.

[0049] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A joint spacer, characterized in that: It comprises a placeholder component and a supply device, wherein the supply device is sealed and arranged inside the placeholder component; The supply device includes a liquid storage container and a supply equipment; the liquid storage container is provided with a first infusion port, and the placeholder component is provided with a second infusion port, the first infusion port is connected to the second infusion port through an infusion tube, and the supply equipment drives the liquid in the liquid storage container to discharge the placeholder component through the infusion 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 control-connected to the supply device, and the sensing device is electrically connected to the controller; The controller controls the supply device to output the liquid in the liquid storage container according to the sensing information of 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 arranged inside the placeholder component and is electrically connected to the controller. The communication module is in communication connection with the mobile terminal.

5. The joint spacer according to claim 2, characterized in that: A piston push plate is arranged inside the liquid storage container, and the supply device is a ball screw motor, which is transmission-connected to the piston push plate.

6. The joint spacer according to claim 2, characterized in that: A three-way mixing container is also provided inside the placeholder component, 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; A screw conveying motor is also provided inside the placeholder component. The screw conveying motor has a medicine storage bin, and the output port of the medicine storage bin 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 provided with a one-way valve to prevent liquid from flowing back into the three-way mixing container.

8. The joint spacer according to claim 2, characterized in that: A drainage cavity is provided inside the space-occupying component, and the infusion tube is connected to the drainage cavity; A plurality of drainage holes are formed on the outside of the placeholder component, and each of the drainage holes is communicated with the drainage cavity.

9. The joint spacer according to claim 2, characterized in that: The placeholder assembly includes a mounting protrusion that is convexly arranged.

10. The joint spacer according to claim 9, characterized in that: It also includes a power supply component for supplying power, and the power supply component is arranged inside the mounting protrusion.

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