An instrument for implanting a posterior cruciate ligament avulsion fracture implant

Abstract

The utility model provides a kind of for implanting after fork ligament avulsion fracture implant's instrument, belong to medical instrument field. Including handle and front rod, the rear end of front rod is connected with handle, the front end of front rod is provided with wire slot and placement hole, placement hole is extended from the end face of the front end of front rod and is arranged in the inside of front rod, simultaneously, placement hole and the wire slot of the side of front rod are communicated, the front end of front rod is also inwardly recessed and is provided with grip mouth. The utility model described instrument structure is relatively simple, and use mode is unique, and the processing cost of instrument is lower, and effectively avoid intraoperative misoperation ； By the instrument of the utility model, the function of fixing object implantation and adjustment can be realized by one instrument, without additional incision and enlarged knee joint incision during operation, the surgery can be completed, the conventional access hole size of arthroscope can meet the requirements, and the secondary injury to the patient is effectively avoided.

Description

Technical Field

[0001] This utility model relates to the field of medical devices, and in particular to a device for implanting implants for posterior cruciate ligament avulsion fractures. Background Technology

[0002] With the increasing incidence of traffic accidents and high-energy sports injuries, the chances of posterior cruciate ligament (PCL) injury have significantly increased. Among these injuries, tibial avulsion fracture of the PCL is a specific form of PCL injury and is relatively common clinically. A PCL avulsion fracture involves a fracture at the attachment point of the PCL in the knee joint. The mechanism involves direct force applied to the tibia during knee flexion, causing posterior displacement or hyperextension injury of the knee joint. The PCL, along with the tibial bone, is avulsed and displaced, leading to PCL laxity and failure. The PCL plays a crucial role in maintaining knee joint stability. The clinical presentation of a PCL tibial avulsion fracture is similar to that of a PCL rupture, resulting in knee instability. If displaced PCL tibial avulsion fractures are not treated promptly, they can lead to serious consequences such as malunion, nonunion, and accelerated knee degeneration. Surgical methods for treating PCL tibial avulsion fractures include arthroscopic surgery and open surgery. Fixation methods include plates, screws, anchors, and sutures. These methods are only applicable in specific situations. For example, plate and screw fixation is suitable for large bone fragment avulsions where the fragments are intact. However, in clinical practice, avulsed bone fragments are often of varying sizes. Screws and anchors themselves have a certain diameter (generally over 4mm). If the bone fragment is small, screwing in the screw may cause secondary fracture of the avulsed bone fragment, and insufficient fixation may lead to surgical failure. Therefore, screw or anchor fixation has the following disadvantages: 1) It has certain limitations in applicable scenarios; 2) It requires screwing the screw into the bone fragment, which can cause secondary trauma to the patient, and the fixation effect is poor; 3) It is a single-point fixation, and the fixation effect is poor. In addition, anchor and suture fixation involves binding the avulsed bone fragment to the tibia. Because the suture itself is thin, it is easy to cut the bone fragment. In addition, in order to ensure fixation strength, multiple turns are usually required, which increases the number of surgical steps and time. In addition, screws and sutures can also cause stress concentration. For example, when screws are used, the force is concentrated near the screw, and when sutures are used, the force is concentrated near the suture. Therefore, whether it is a point fixation such as a screw / anchor or a fine line fixation such as a suture, stress concentration will occur.

[0003] Currently, to achieve better fixation, tibial avulsion fractures of the PCL (peripheral joint) are also treated by implanting fixation devices. However, existing single instruments cannot achieve the function of implanting and adjusting fixation devices. Multiple instruments need to be used in combination to achieve the implantation and adjustment of fixation devices. The operation is cumbersome, inconvenient, and prone to intraoperative errors. Moreover, when multiple instruments are used in combination, the conventional arthroscopic incision size cannot meet the requirements. In order to successfully implant fixation devices, additional incisions and enlargement of the intraoperative incision of the knee joint may be required to enlarge the incision to complete the surgery. This is not only time-consuming and laborious, increasing the operation time, but also easily causing secondary damage to the patient. Utility Model Content

[0004] In view of this, the present invention aims to provide an instrument for implanting implants for posterior cruciate ligament avulsion fractures, which can solve the problem that multiple instruments need to be used in combination when implanting fixation devices, and the implantation and adjustment functions cannot be achieved simultaneously.

[0005] To achieve the above objectives, the technical solution of this utility model is as follows: A device for implanting implants for posterior cruciate ligament avulsion fractures includes a handle and a front rod. The rear end of the front rod is connected to the handle, and the front end of the front rod is provided with a wire groove and a placement hole. The placement hole extends from the end face of the front end of the front rod and is disposed inside the front rod. At the same time, the placement hole communicates with the wire groove on the side of the front rod, and the front end of the front rod is also recessed inward to provide a gripping opening.

[0006] Furthermore, there are two cable channels, which are symmetrically arranged on the side wall of the front rod, and the top of the cable channels are connected to the handle opening.

[0007] Furthermore, the front stick and the handle are both hollow structures. When the front stick and the handle are connected together, the hollow structures of the front stick and the hollow structures of the handle are connected and coaxially arranged.

[0008] Furthermore, the diameter of the hollow structure of the front rod is greater than or equal to the diameter of the hollow structure of the handle.

[0009] Furthermore, the placement hole and the hollow structure of the front rod are connected.

[0010] Furthermore, all edges of the front rod are chamfered.

[0011] Compared with existing technologies, the device for implanting posterior cruciate ligament avulsion fracture implants described in this utility model has the following advantages:

[0012] (1) This utility model can realize the functions of implantation and adjustment of fixation with one device. The diameter of the front end of the device is approximately equal to the size of the arthroscope. Using this device, implantation can be successfully completed under the conventional arthroscopic surgical incision without additional incision or enlargement of the knee joint surgical incision, which can effectively avoid secondary damage to the patient.

[0013] (2) All positions of the instrument described in this utility model are designed with obtuse angles, so that it will not cause secondary damage to soft tissue and bone during the operation; and the instrument holds the fixation object in the cannula. When the cannula is pushed in along the suture with a smooth surface, it can not only be accurately pushed to the designated position, but also effectively avoid the fixation object from getting entangled with the surrounding soft tissue and causing soft tissue impaction, which greatly improves the efficiency of the operation and reduces the risk of implantation failure.

[0014] (3) The structure of the instrument described in this utility model is relatively simple. There are no multiple options for the placement of the implant, and it can only be placed in one way. Therefore, the usage method is unique, the processing cost of the instrument is low, and since the assembly method of the instrument and the implant is unique, it effectively avoids intraoperative misoperation. Attached Figure Description

[0015] The accompanying drawings, which form part of this utility model, are used to provide a further understanding of the utility model. The illustrative embodiments of the utility model and their descriptions are used to explain the utility model and do not constitute an undue limitation of the utility model. In the drawings:

[0016] Figure 1 This is a schematic diagram of the structure of a device for implanting an implant for posterior cruciate ligament avulsion fractures, as described in an embodiment of this utility model.

[0017] Figure 2 This is the front view of the front pole;

[0018] Figure 3 This is a schematic diagram of the front rod structure;

[0019] Figure 4 This is a schematic diagram showing the front rod and the two pressure plates after installation.

[0020] Explanation of reference numerals in the attached figures:

[0021] 1. Handle; 2. Front rod; 3. Grip opening; 4. Cable groove; 5. Placement hole; 6. Hollow structure; 7. Short pressure plate; 8. Long pressure plate. Detailed Implementation

[0022] It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments can be combined with each other.

[0023] The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0024] like Figures 1-4As shown, this utility model relates to an instrument for implanting fixation devices for posterior cruciate ligament avulsion fractures. The fixation device includes two pressure plates (a short pressure plate 7 and a long pressure plate 8) and a connecting coil. The short pressure plate 7 and the long pressure plate 8 are both elongated strips, connected by the connecting coil. The short pressure plate 7 and the long pressure plate 8 can move along the connecting coil. In addition, suture holes for suture passage are provided on both sides of the short pressure plate 7 and the long pressure plate 8. This instrument can perform the functions of implantation, installation, and adjustment of the fixation device.

[0025] The implantation device of this utility model includes a handle 1 and a front rod 2. The rear end of the front rod 2 is connected to the handle 1. Both the front rod 2 and the handle 1 have hollow structures 6. When the front rod 2 and the handle 1 are connected together, the hollow structures 6 of the front rod 2 and the hollow structures 6 of the handle 1 are connected and coaxially arranged. The handle 1 is a conventional handle 1, which can achieve connection with the front rod 2 and allow Kirschner wires to pass smoothly.

[0026] The front end of the front rod 2 is provided with a groove 4 and a placement hole 5. A gripping opening 3 is also recessed inward at the front end of the front rod 2. Two grooves 4 are symmetrically arranged on the side wall of the front rod 2, and the top of the grooves 4 communicates with the gripping opening 3. The placement hole 5 extends from the end face of the front end of the front rod 2 and is located inside the front rod 2. The placement hole 5 communicates with the two grooves 4 on the side of the front rod 2 and the hollow structure 6 of the front rod 2. After placing the fixation object in the placement hole 5 and inserting it into the preset installation position, a Kirschner wire is inserted into the hollow structure 6. The operator can then push the fixation object out using the Kirschner wire. Because the groove 4 at the front end of the instrument is axial and the gripping opening 3 is radial, after the fixation object is pushed out, it can be inserted into the long side of the fixation object through the gripping opening 3. That is, after rotating the fixation object 90°, it lies horizontally on the gripping opening at the front end of the instrument. Then, the fixation object is adjusted to the appropriate position using the gripping opening 3 structure at the front end of the instrument, thus completing the installation of the fixation object.

[0027] Preferably, the diameter of the hollow structure 6 of the front bar 2 is greater than or equal to the diameter of the hollow structure 6 of the handle 1, so that the Kirschner wire can pass smoothly through the hollow structure 6 of the instrument.

[0028] Preferably, all edges of the front rod 2 are chamfered. In the description of this utility model, it should be understood that the terms "center," "front," "rear," "top," "bottom," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. In the description of this utility model, unless otherwise stated, "a plurality of" means two or more.

[0029] In actual work, when it is necessary to use the device described in this utility model to implant a fixation device into the patient's body, firstly, the fixation device is threaded with sutures outside the body, and then the two pressure plates are overlapped and placed into the placement hole 5 of the device. The connecting coil and sutures of the fixation device are both passed through the suture groove 4, thus completing the pre-assembly process of the device and the fixation device.

[0030] After the instrument carrying the fixation device is inserted into the vicinity of the pre-positioned position through the intraoperative incision of the knee joint, the remaining sutures outside the patient's body are pulled, and a Kirschner wire is inserted through the hollow structure 6 of the instrument to the front end of the front rod 2, and then the fixation device is pushed out through the Kirschner wire.

[0031] Adjust the instrument's direction so that the handle 3 aligns with the long side of the fixation device. Then, push the instrument until the handle 3 contacts the pressure plate and is embedded in the long side of the fixation device. Continue pushing the instrument to adjust both pressure plates to the appropriate positions. Tighten the suture and tie a knot in the connecting coil (this step can be ignored if the connecting coil is a fixed length coil). Then, thread the suture through the pre-placed channel in the knee joint to complete the knot fixation. At this point, the fixation device can be successfully implanted into the patient's body.

[0032] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A device for implanting an implant for posterior cruciate ligament avulsion fractures, characterized in that: It includes a handle (1) and a front rod (2). The rear end of the front rod (2) is connected to the handle (1). The front end of the front rod (2) is provided with a wire groove (4) and a placement hole (5). The placement hole (5) extends from the end face of the front end of the front rod (2) and is located inside the front rod (2). At the same time, the placement hole (5) is connected to the wire groove (4) on the side of the front rod (2). The front end of the front rod (2) is also recessed inward and provided with a grip opening (3).

2. The device for implanting a posterior cruciate ligament avulsion fracture implant according to claim 1, characterized in that: There are two wire grooves (4), which are symmetrically arranged on the side wall of the front rod (2), and the top of the wire groove (4) is connected to the handle opening (3).

3. The device for implanting a posterior cruciate ligament avulsion fracture implant according to claim 1, characterized in that: The front rod (2) and the handle (1) are hollow structures (6). When the front rod (2) and the handle (1) are connected together, the hollow structure (6) of the front rod (2) and the hollow structure (6) of the handle (1) are connected and coaxially arranged.

4. The device for implanting a posterior cruciate ligament avulsion fracture implant according to claim 3, characterized in that: The diameter of the hollow structure (6) of the front rod (2) is greater than or equal to the diameter of the hollow structure (6) of the handle (1).

5. The device for implanting an implant for posterior cruciate ligament avulsion fractures according to claim 4, characterized in that: The hollow structure (6) of the placement hole (5) and the front rod (2) are connected.

6. The device for implanting a posterior cruciate ligament avulsion fracture implant according to claim 1, characterized in that: All edges of the front rod (2) are chamfered.

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