A combination tool for minimally invasive reduction and fixation of acetabular quadrature plate fractures

Abstract

This utility model relates to a combination tool for minimally invasive reduction and fixation of acetabular quadrature plate fractures, belonging to the field of medical devices. It includes a reduction gun body, a long-arm clamp located at the front end of the reduction gun body, a pressure rod passing through the reduction gun body, a short-arm clamp sleeved on the pressure rod and located on one side of the reduction gun body, a sleeve sight sleeved on the pressure rod and located on the other side of the reduction gun body, and a hollow screw sleeve located at the end of the sleeve sight. The hollow screw sleeve can be fitted with a hollow screw, and the axis of the hollow screw sleeve passes through the distal end of the long-arm clamp. This utility model is suitable not only for minimally invasive reduction of significantly displaced acetabular fractures via small incisions, but also for assisting in reduction and fixation during surgery for complex double-column fractures, patients with multiple systemic injuries, and patients with burns or skin degloving injuries who cannot tolerate extensive open reduction and internal fixation, thus reducing surgical risks.

Description

Technical Field

[0001] This utility model relates to the field of medical devices, and in particular to a combination tool for minimally invasive reduction and fixation of acetabular quadrature plate fractures. Background Technology

[0002] Displaced acetabular fractures are often caused by high-energy trauma and require open reduction and internal fixation. Traditional open reduction and internal fixation requires extensive soft tissue dissection, which not only leads to greater blood loss, slower wound healing, and a higher risk of infection, but also increases the likelihood of nerve and blood vessel damage and heterotopic ossification. These complications are not related to the fracture itself, but are closely related to the extensive surgical exposure of the fracture during the operation.

[0003] For patients with displaced quadrangular plate fractures of the acetabulum, anatomical reduction and proper fixation of the quadrangular plate fracture are crucial steps for surgical success and essential for ensuring a good long-term prognosis. Given the complexity of the pelvic structure and the presence of many important nerves and blood vessels around the quadrangular plate, minimally invasive reduction of displaced quadrangular plate fractures can reduce extensive stripping in the quadrangular plate area, thereby reducing the risk of damage to nerves, blood vessels, and other tissues.

[0004] Currently, there is still no suitable dedicated tool in clinical practice for minimally invasive reduction and simultaneous fixation of displaced quadrangular plate fractures. Although pistol-type reduction forceps have been used for quadrangular plate fracture reduction, the angle and shape of the hook at the tip of the long arm for fixing the quadrangular plate, as well as the arched design of the long arm, cannot adequately match the anatomical morphology of the quadrangular plate and iliac fossa. This results in the hook at the tip of the long arm of the pistol-type reduction forceps not being able to fully grasp the quadrangular plate fracture fragments to complete the fracture reduction during minimally invasive reduction. The arched design of the long arm significantly increases local soft tissue tension, severely affecting the operation of the reduction forceps. Utility Model Content

[0005] The purpose of this invention is to provide a combination tool for minimally invasive reduction and fixation of acetabular quadrature plate fractures. In addition to being suitable for minimally invasive reduction of acetabular fractures with significant displacement through small incisions, it can also be used for auxiliary reduction and fixation during surgery for complex double-column fractures, patients with multiple injuries, burns, or skin degloving injuries, etc., in cases where patients cannot tolerate extensive open reduction and internal fixation, thereby reducing surgical risks.

[0006] To achieve the above objectives, the present invention provides a combination tool for minimally invasive reduction and fixation of acetabular quadrature plate fractures, comprising a reduction gun body, a long-arm clamp located at the front end of the reduction gun body, a pressure rod passing through the reduction gun body, a short-arm clamp sleeved on the pressure rod and located on one side of the reduction gun body, a sleeve sight sleeved on the pressure rod and located on the other side of the reduction gun body, and a hollow screw sleeve located at the end of the sleeve sight; the hollow screw sleeve can be fitted with a hollow screw, and the axis of the hollow screw sleeve passes through the distal end of the long-arm clamp.

[0007] Preferably, in use, the long-arm clamp and the short-arm clamp are placed at the fracture site of the acetabular quadrant and the lateral wall of the pelvis through small incisions, respectively. After being combined with the reduction gun body, the position of the guide pin is adjusted by the sleeve aiming device to achieve minimally invasive reduction and fixation of the fracture, which reduces surgical trauma, blood loss and infection risk, while ensuring fixation effect.

[0008] Preferably, the long-arm clamp is curved and elongated, with a hook-shaped distal end and a body that conforms to the shape of the iliac fossa.

[0009] Preferably, the long-arm clamp is detachably connected to the reset gun body.

[0010] Preferably, the short-arm clamp is in the shape of a slanted plate with the tip protruding inward.

[0011] Preferably, the short-arm clamp is detachably connected to the pressure rod.

[0012] Preferably, the tails of both the long-arm pliers and the short-arm pliers are square structures with holes and have internal slots.

[0013] Preferably, the sleeve sight can rotate along the pressure rod to achieve arc motion.

[0014] Preferably, the sleeve sight includes two mutually slidingly combined structures to facilitate adjustment of the sleeve sight length.

[0015] Preferably, a screw for fixing is provided between the two sliding combinations of the sleeve sight.

[0016] In summary, this utility model has the following beneficial technical effects:

[0017] In recent years, percutaneous screw fixation (channel screw technique) has been widely used in the treatment of non-displaced or anatomically reduceable acetabular fractures due to its advantages such as less blood loss, lower infection rate, less soft tissue damage, and faster recovery. Anterior column screws, posterior column screws, and Magic screws are common fixation methods. This combination tool, while retaining the advantages of this technique, achieves minimally invasive reduction of displaced quadrangular plate fracture fragments through a small incision. The Magic screw is precisely placed through a hollow screw sleeve to ensure fracture fragment fixation. Its unique combination design ensures that fracture reduction and screw fixation do not interfere with each other; reduction maintenance and screw insertion are performed simultaneously, avoiding fracture fragment separation caused by screw placement.

[0018] Furthermore, this tool has a wide range of applications. Besides being suitable for minimally invasive reduction and fixation of significantly displaced acetabular fractures via small incisions, it can also assist in open reduction and internal fixation of quadrangular plate fractures in complex double-column fracture surgeries. For patients with multiple systemic injuries, burns, or degloving injuries who cannot tolerate extensive open reduction and internal fixation, this tool provides a feasible treatment option, effectively reducing surgical risks for these patients. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the long-arm forceps in a combination tool for minimally invasive reduction and fixation of acetabular quadrature plate fractures according to the present invention.

[0020] Figure 2 This is a schematic diagram of the short-arm forceps in a combination tool for minimally invasive reduction and fixation of acetabular quadrature plate fractures according to this utility model;

[0021] Figure 3 This is a schematic diagram of the reduction gun body in a combination tool for minimally invasive reduction and fixation of acetabular quadrature plate fractures according to this utility model.

[0022] Figure 4 This is a schematic diagram of the disassembled structure of the sleeve aiming device in the combined tool for minimally invasive reduction and fixation of acetabular quadrature plate fractures according to this utility model;

[0023] Figure 5 This is a schematic diagram of the hollow screw and hollow screw sleeve in a combination tool for minimally invasive reduction and fixation of acetabular quadrature plate fractures according to this utility model;

[0024] Figure 6 This is a schematic diagram of the combined tool for minimally invasive reduction and fixation of acetabular quadrature plate fractures according to the present invention.

[0025] Reference numerals: 1. Long-arm pliers; 2. Short-arm pliers; 3. Reset gun body; 4. Sleeve sight; 5. Outer sleeve; 6. Hollow screw sleeve; 7. Hollow screw; 8. Pressure rod. Detailed Implementation

[0026] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0027] This utility model discloses a medical device specifically for minimally invasive reduction and fixation of displaced acetabular quadrature plate fractures, including a long-arm clamp 1, a short-arm clamp 2, a reduction gun 3, a sleeve aiming device 4, and a hollow screw sleeve 6. Through carefully designed structures and connections, these components work together to complete the fracture reduction and fixation tasks, reducing surgical trauma while improving reduction accuracy and fixation stability.

[0028] The long-arm forceps 1 is a curved, elongated strip with a hook-shaped distal end and a large bending angle. This design allows it to effectively hook onto the fractured fragments of the acetabular quadrature plate. Its body is shaped according to the anatomy of the iliac fossa, ensuring a high degree of fit and minimizing traction on local soft tissues during placement and manipulation, thus reducing soft tissue tension and facilitating flexible manipulation by the surgeon. The tail end has a square structure with a hole and an internal locking groove. During surgery, the long-arm forceps 1 is placed on the fractured fragments of the quadrature plate. The square hole at the tail end allows for precise locking and fixation to one end of the reduction gun body 3, establishing a stable connection. Its main function is to hook onto the fractured fragments of the quadrature plate during reduction, providing a point of leverage for reduction, and continuously maintaining the position of the fractured fragments during subsequent screw insertion, preventing displacement.

[0029] The short-arm clamp 2 is shaped like a slanted plate with a slightly inward-protruding tip. This structure facilitates gripping the lateral wall of the pelvis and allows for stable embedding into a specific position within it. The tail is also square, with a hole and an internal slot. During surgery, the short-arm clamp 2 is placed on the lateral wall of the pelvis and, through the square hole at the tail, precisely engages and secures with the pressure rod 8 of the reduction gun body 3, forming a stable connection. During the reduction operation, the short-arm clamp 2 acts as a support point, working in conjunction with the long-arm clamp 1. During pressure application, the two cooperate to achieve precise reduction of the fracture fragments.

[0030] The reduction gun body 3 has a pressure rod 8 at its top, with its end specifically designed to connect to the long-arm forceps 1. The pressure rod 8 is a round rod that runs through the reduction gun body 3. As the core component of the entire tool, the reduction gun body 3 plays a crucial role in connecting the long-arm forceps 1 and the short-arm forceps 2. During the operation, the pressure rod 8 is used to reduce the fracture fragments, and pressure is continuously maintained after reduction to ensure the stable position of the fracture fragments, providing a good foundation for subsequent fixation operations.

[0031] The sleeve sight 4 has one end for mounting the pressure rod 8 and the other end for connecting the hollow screw sleeve 6 to the outer sleeve 5. The middle section is designed as a sliding structure and secured with screws, allowing the sight's length to be adjusted as needed. During surgery, the sleeve sight 4 is connected to the tail end of the pressure rod 8. When the sleeve sight 4 is fully engaged and on the same plane as the gun body, the axis of the hollow screw sleeve 6 is aligned with the hook tip at the distal end of the long arm clamp 1. Because the pressure rod 8 of the gun body is cylindrical, when the sleeve sight 4, mounted on the pressure rod 8, rotates around the axis of the pressure rod 8, the hollow screw sleeve 6 mounted on the sleeve sight 4 also performs a corresponding arc motion. The guide pin driven into the hollow screw sleeve 6 is located around the hook at the distal end of the long arm clamp 1. By adjusting the rotation angle and length of the sleeve aiming device 4 on the pressure rod 8, the position of the guide pin on the quadrilateral plate can be precisely controlled with the distal hook of the long arm clamp 1 as a reference point. This ensures that the Magic screw, screwed in along the guide pin, is in the correct position at the quadrilateral plate fracture fragment, effectively preventing the screw from penetrating the hip joint and maximizing the fixation of the quadrilateral plate bone fragment.

[0032] The outer sleeve 5 is a cylindrical sleeve located at the end of the sleeve aimer 4 furthest from the pressure rod 8, and is used to mate with the hollow screw sleeve 6. Its main function is to serve as a support structure for the hollow screw sleeve 6, ensuring the accurate and stable position of the hollow screw sleeve 6 during operation, and providing assurance for the precise driving of the screw.

[0033] The hollow screw sleeve 6 is also a cylindrical sleeve that mates with the hollow screw 7. Its axis is aligned with the hook tip at the distal end of the long-arm forceps 1. This design ensures that the direction of screw insertion matches the fixation requirements of the fracture fragment. During surgery, the hollow screw sleeve 6 is inserted into the outer sleeve 5 to guide the hollow screw 7 along the correct path into the quadrangular plate fracture fragment, ensuring accurate screw placement and preventing the screw from penetrating the hip joint, thereby achieving precise fixation of the fracture fragment.

[0034] The hollow screw 7 is a 6.5 mm cylindrical screw with a threaded head, used to fix the fracture fragment. During surgery, the hollow screw 7 is driven into the quadrangular plate fracture fragment along the hollow screw sleeve 6. Through the tight engagement between the screw and the fracture fragment, the quadrangular plate fracture fragment is fixed, maintaining its reduced position and promoting fracture healing. Because the reduction forceps firmly hold the reduced quadrangular plate fracture fragment in place while the screw is being screwed in, the screw insertion will not cause separation of the fracture fragment, ensuring the stability and reliability of the fixation process.

[0035] The pressure rod 8 is part of the reduction gun body 3, and is a round rod that runs through the reduction gun body 3. During surgery, one end of the pressure rod 8 is connected to the short-arm forceps 2, and the other end is connected to the sleeve sight 4. Through pressure application, the pressure rod 8 can reduce the fracture fragments and maintain pressure after reduction to ensure the stability of the fracture fragments. At the same time, the pressure rod 8 serves as the rotation axis of the sleeve sight 4, enabling the sleeve sight 4 to move in an arc, thereby precisely controlling the position of the guide pin and providing conditions for accurate screw insertion.

[0036] In actual surgical procedures, the long-arm forceps 1 are first placed at the fracture site of the acetabular quadrant through a small incision, while the short-arm forceps 2 are placed on the lateral wall of the pelvis. Since both the long-arm forceps 1 and the short-arm forceps 2 have circular slots with holes at their ends, they can be smoothly combined with the reduction gun body 3 to form a complete reduction instrument. Then, one end of the sleeve aiming device 4 is inserted into the tail end of the pressure rod 8, and the other end is inserted into the outer sleeve 5 of the hollow screw 7. By adjusting the length and rotation angle of the sleeve aiming device 4, using the distal hook of the long-arm forceps 1 as a reference point, the position of the guide pin is precisely controlled, thus ensuring the correct insertion of the screw. Throughout the process, the reduction forceps continuously maintain the reduction state of the fracture fragments, and the screw-in operation does not interfere with each other, ensuring the integrated completion of reduction and fixation.

[0037] This novel minimally invasive reduction and fixation combination tool for acetabular quadrature plate fractures allows for minimally invasive reduction of displaced quadrature plate fracture fragments through a small incision, reducing surgical trauma, blood loss, and infection risk. Simultaneously, the Magic screw is correctly positioned at the fracture fragment using a cannulated screw 7 and an outer sleeve 5, ensuring effective screw fixation. Utilizing the independent design of fracture reduction and screw fixation, it maintains the reduction of the quadrature plate fracture fragments while ensuring that screw insertion does not cause fragment separation. Besides being suitable for minimally invasive reduction of significantly displaced acetabular fractures via a small incision, it can also be used for auxiliary reduction and fixation of quadrature plate fractures during open reduction and internal fixation in complex two-column fracture surgeries, and is applicable to patients with multiple systemic injuries, burns, or degloving injuries who cannot tolerate extensive open reduction and internal fixation. It has broad application prospects and significant technical advantages.

[0038] Finally, it should be noted that the above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. 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 combination tool for minimally invasive reduction and fixation of acetabular quadrature plate fractures, characterized in that, The device includes a reset gun body (3), a long-arm clamp (1) located at the front end of the reset gun body (3), a pressure rod (8) passing through the reset gun body (3), a short-arm clamp (2) sleeved on the pressure rod (8) and located on one side of the reset gun body (3), a sleeve sight (4) sleeved on the pressure rod (8) and located on the other side of the reset gun body (3), and a hollow screw sleeve (6) located at the end of the sleeve sight (4); the hollow screw sleeve (6) can be fitted with a hollow screw (7), and the axis of the hollow screw sleeve (6) passes through the far end of the long-arm clamp (1).

2. The combined tool for minimally invasive reduction and fixation of acetabular quadrature plate fractures according to claim 1, characterized in that, The long-arm clamp (1) is curved and long, with a hook-shaped distal end and a body that fits the shape of the iliac fossa.

3. The combined tool for minimally invasive reduction and fixation of acetabular quadrature plate fractures according to claim 2, characterized in that, The long-arm clamp (1) is detachably connected to the reset gun body (3).

4. The combined tool for minimally invasive reduction and fixation of acetabular quadrature plate fractures according to claim 3, characterized in that, The short-arm clamp (2) is shaped like an oblique plate with its tip protruding inward.

5. The combined tool for minimally invasive reduction and fixation of acetabular quadrature plate fractures according to claim 4, characterized in that, The short-arm clamp (2) is detachably connected to the pressure rod (8).

6. The combined tool for minimally invasive reduction and fixation of acetabular quadrature plate fractures according to claim 5, characterized in that, Both the long-arm pliers (1) and the short-arm pliers (2) have square structures with holes at their tails and slots inside.

7. A combination tool for minimally invasive reduction and fixation of acetabular quadrature plate fractures according to any one of claims 1-6, characterized in that, The sleeve aiming device (4) can rotate along the pressure rod (8) to achieve circular motion.

8. The combined tool for minimally invasive reduction and fixation of acetabular quadrature plate fractures according to claim 7, characterized in that, The sleeve sight (4) includes two mutually slidingly combined structures to facilitate adjustment of the length of the sleeve sight (4).

9. The combined tool for minimally invasive reduction and fixation of acetabular quadrature plate fractures according to claim 8, characterized in that, The two sliding assembly structures of the sleeve sight (4) are provided with screws for fixing.

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