Miniature external fixing device applied to patella open fracture treatment and teaching

Abstract

The utility model discloses a miniature external fixing device applied to patella open fracture treatment and teaching, which comprises a plurality of fixing arms, a plurality of connecting holes are arranged on the fixing arms at equal intervals, and rod-shaped pieces are symmetrically inserted into the corresponding connecting holes to enable the fixing arms to form a whole. Restraining mechanisms are fixedly connected into the remaining connecting holes, and a kirschner wire is connected between the symmetrical constraining mechanisms on the same fixing arm. The fixing device is composed of the semicircular outer fixing arms, the kirschner wire, the screw rods and the fixing nuts, the semicircular outer fixing arms are sleeved with the kirschner wire from the upper portion and the lower portion of the kirschner wire respectively, then the upper screw rod and the lower screw rod penetrate through the corresponding connecting holes in the semicircular outer fixing arms respectively, and after fracture reduction is satisfactory through perspective, the fixing nuts are used for reinforcing; the fixing mode is firm in fixing, can replace a steel wire and a kirschner wire to treat patella open fracture, has the advantages of being minimally invasive and firm in fixing, and the in-vitro fixing strength can be adjusted according to needs.

Description

Technical Field

[0001] This utility model belongs to the field of orthopedic medical devices, specifically a miniature external fixation device for the treatment and teaching of open patellar fractures. Background Technology

[0002] Patellar fractures are common clinical injuries. The current surgical approach involves open reduction followed by fixation with Kirschner wire tension bands. The procedure is as follows: After reduction, the patella is temporarily fixed using patellar clamps; two Kirschner wires or patellar pins (with a central gate and a groove for easy breakage) are inserted perpendicular to the fracture line; a wire of appropriate length is threaded onto both ends of the Kirschner wires or patellar pins, then crossed on the lateral side of the patella. The ligaments and fascia on the patellar surface are then cut along the wire's path using an electrocautery or circular knife, and finally, the wire is tightly wrapped around the fracture to fix it. This surgical technique is simple, and the fracture generally heals well. However, during surgery, it has been found that when using patellar pins for fixation, after the wire passes through the gate, when tightening the band, the wire on the other side of the gate becomes stuck and cannot be stretched. Often, it is necessary to use Kirschner wires on the opposite side to tighten the wire.

[0003] A Chinese patent discloses an internal fixation device for patellar fracture (CN110478025A). By sliding a pressure sleeve along the patellar pin within the synovial cavity, the fractured parts can be brought closer together to achieve a concentric compression effect. On this basis, a locking wire is used to tighten and fix the device, making the fixation more secure and effectively preventing the fixation device from falling off, shifting, or irritating soft tissues. At the same time, because the pressure sleeve can slide effectively, it can fully utilize the advantages of tension band fixation, allowing for early joint mobilization and preventing knee joint ankylosis.

[0004] Currently, there are few dedicated external fixators for open patellar fractures. Steel wires and Kirschner wires are commonly used as substitutes, but their fixation effect and stability are not good, and the strength of external fixation cannot be adjusted as needed. Utility Model Content

[0005] To solve the above problems, the present invention adopts the following technical solution.

[0006] A miniature external fixation device for the treatment and teaching of open patellar fractures includes multiple fixation arms with multiple connecting holes equidistantly arranged on each arm. The connecting holes are symmetrically distributed along the perpendicular bisector of the arm. Rod-shaped members are symmetrically inserted into the corresponding connecting holes to form a single unit. A restraint mechanism is fixedly connected to the remaining connecting holes, and Kirschner wires are connected between the symmetrical restraint mechanisms on the same arm. The restraint mechanism includes a fixation block, a compression sleeve is fixedly inserted into the upper surface of the fixation block, and a first through hole is formed on the side of the fixation block. After the Kirschner wire passes through the fixation block through the first through hole, the compression sleeve compresses and fixes the Kirschner wire in the first through hole.

[0007] A second through hole is provided on the side of the extrusion core sleeve, and the diameter of the second through hole is equal to the diameter of the first through hole. When the extrusion core sleeve is inserted into the fixing block, the opening paths of the first through hole and the second through hole are in the same direction.

[0008] A threaded sleeve is integrally connected to the other side of the fixing block. The diameter of the threaded hole of the threaded sleeve is the same as the diameter of the pin hole. A stud is threaded onto the threaded sleeve, and an end cap with a diameter larger than the pin hole diameter is integrally connected to the end of the stud.

[0009] The rod-shaped member includes a first screw, which is symmetrically distributed on the fixed arm. A first nut is threadedly connected to the first screw on both sides of the fixed arm.

[0010] The rod-shaped component also includes a second screw, which is also symmetrically distributed on the fixed arm. A second nut is threaded onto the second screw on both sides of the fixed arm.

[0011] The connecting holes that connect to the first screw are symmetrically and equidistantly distributed downwards along the top of the fixed arm. The connecting holes that connect to the second screw are symmetrically and equidistantly distributed upwards along both ends of the bottom of the fixed arm. The connecting hole between the upper and lower holes is a pinhole used to connect with the restraint mechanism.

[0012] The fixed arm has a semi-ring structure.

[0013] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0014] This application consists of a semi-circular external fixator, Kirschner wires, screws, and a fixation nut. The Kirschner wires pass through the fracture line from one side to the other. The semi-circular external fixator is then inserted into the Kirschner wires from the top and bottom. The upper and lower screws are then passed through the corresponding connecting holes on the semi-circular external fixator. When fluoroscopy indicates satisfactory fracture reduction, the fixation nut is used for reinforcement. This fixation method provides strong fixation and can replace steel wires and Kirschner wires in the treatment of open patellar fractures. It is minimally invasive and provides strong fixation. The strength of the external fixation can be adjusted as needed.

[0015] This application changes the fixation method from Kirschner wire fixation to Kirschner wire traction. The traditional treatment involves passing Kirschner wires through the fracture point to connect the bone and then using steel wires to tighten and fix it. This application involves breaking the bone with Kirschner wires and connecting both ends of the Kirschner wires to a semi-circular external fixation arm. The external fixation arm is tightened by screws to traction and fix the fracture site. This method causes secondary damage to the fracture surface by the Kirschner wires, which accelerates the fracture healing speed to a certain extent. When the Kirschner wires are removed later, no secondary damage will be caused to the healing surface.

[0016] Regarding the connection between Kirschner wires and the external fixation arm, the restraint mechanism provided in this application can connect Kirschner wires relatively easily. After the Kirschner wires are connected to the restraint mechanism, cutting off the excess part of the Kirschner wires will not cause the Kirschner wires to shake and cause secondary damage to the bones. Furthermore, it is more convenient to remove the Kirschner wires later. Attached Figure Description

[0017] Figure 1 This is an overall assembly drawing of the miniature external fixation device.

[0018] Figure 2 Top view of the external fixation device assembly.

[0019] Figure 3 Front view of the external fixation device assembly.

[0020] Figure 4 This is an assembly diagram of the restraint mechanism and Kirschner wires.

[0021] Figure 5 This is an exploded view of the restraint mechanism.

[0022] Figure 6 A sectional view of the restraint mechanism assembly.

[0023] The correspondence between the labels and component names in the attached figures is as follows:

[0024] 100. External fixing arm; 101. First screw; 101a. First nut; 102. Second screw; 102a. Second nut; 103. Restraint mechanism; 103a. Fixing block; 103a-1. First through hole; 103a-2. Screw sleeve; 103b. Extrusion core sleeve; 103b-1. Second through hole; 103c. Stud; 104. Kirschner wire. Detailed Implementation

[0025] To make the above-mentioned objectives, features and advantages of this utility model more apparent and understandable, the specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings.

[0026] Many specific details are set forth in the following description in order to provide a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Those skilled in the art can make similar extensions without departing from the spirit of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0027] Secondly, the term "an embodiment" or "embodiment" as used herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present invention. The phrase "in one embodiment" appearing in different places in this specification does not necessarily refer to the same embodiment, nor is it a single or selective embodiment that excludes other embodiments. The present invention provides the following embodiments.

[0028] Please see Figure 1-3 A miniature external fixation device for the treatment and teaching of open patellar fractures includes multiple semi-annular fixation arms 100. Multiple connecting holes are equidistantly arranged on each fixation arm 100. These connecting holes are categorized by function and location as upper holes, lower holes, and pinholes, and are symmetrically distributed about the perpendicular bisector of each fixation arm 100. A first screw 101 is inserted into the upper hole on the same side of each fixation arm 100. First nuts 101a are threaded onto the first screw 101 on both sides of the fixation arm 100, clamping the fixation arm 100 onto the first screw 101 using the first nuts 101a. Further, to strengthen... A second screw 102 is inserted into the lower hole on the same side of multiple fixed arms 100. A second nut 102a is threaded onto the second screw 102 and located on both sides of the fixed arm 100. The fixed arm 100 is clamped onto the second screw 102 by the second nut 102a. The first screw 101 and the second screw 102 are collectively referred to as rods. The rods are symmetrically inserted into the corresponding connection holes so that the multiple fixed arms 100 form a whole. A binding mechanism 103 is fixedly connected in the pin hole, and Kirschner wires 104 are connected between the symmetrical binding mechanisms 103 on the same fixed arm 100.

[0029] exist Figure 4-6In existing technologies, the portion of the Kirschner wire 104 extending beyond the patella needs to be bent into a buckle shape to facilitate the passage of the steel wire. This application, due to the use of an external fixation arm 100, only requires connecting the Kirschner wire 104 to the external fixation arm 100 after it passes through the patella to cut off the remaining portion, preventing the Kirschner wire 104 from being too long and accidentally collided. Specifically, the restraint mechanism 103 includes a fixing block 103a, with a compression core sleeve 103b fixedly inserted into the upper surface of the fixing block 103a, and a wire penetrating the side of the fixing block 103a... The opening has a first through hole 103a-1. The Kirschner wire 104 passes through the first through hole 103a-1 and then through the fixing block 103a. The bottom of the compression sleeve 103b then presses and fixes the Kirschner wire 104 within the first through hole 103a-1. Furthermore, this application also provides another fixing scheme for the Kirschner wire 104. Specifically, a second through hole 103b-1 is opened on the side of the compression sleeve 103b, and the diameter of the second through hole 103b-1 is equal to the diameter of the first through hole 103a-1. When the compression sleeve 103a-1... When the extrusion sleeve 103b is inserted into the fixing block 103a, the opening paths of the first through hole 103a-1 and the second through hole 103b-1 are oriented in the same direction. The extrusion sleeve 103b is pulled out of the fixing block 103a, and the Kirschner wire 104 passes through the second through hole 103b-1 on the extrusion sleeve 103b before the extrusion sleeve 103b is inserted into the fixing block 103a. To facilitate the connection between the binding mechanism 103 and the pin hole on the fixing arm 100, a threaded sleeve 103a-2 is integrally connected to the other side of the fixing block 103a. The diameter of the screw hole of -2 is the same as the diameter of the pin hole. A stud 103c is threaded onto the screw sleeve 103a-2, and an end cap with a diameter larger than the pin hole diameter is integrally connected to the end of the stud 103c. After the stud 103c passes through the pin hole, the screw sleeve 103a-2 is aligned with the stud 103c. Then the stud 103c is rotated so that the stud 103c is threadedly connected to the screw sleeve 103a-2. Thus, the clamping force between the stud 103c and the screw sleeve 103a-2 is used to fix the entire binding mechanism 103 onto the pin hole of the outer fixing arm 100.

[0030] The above description, in conjunction with specific embodiments, provides a further detailed explanation of the present utility model. It should not be construed that the specific implementation of the present utility model is limited to these descriptions. For those skilled in the art, several simple deductions or substitutions can be made without departing from the concept of the present utility model, and all such deductions or substitutions should be considered to fall within the scope of protection defined by the claims submitted by the present utility model.

Claims

1. A miniature external fixation device for the treatment and teaching of open patellar fractures, comprising multiple fixation arms (100), with multiple connecting holes equidistantly provided on the fixation arms (100), the connecting holes being symmetrically distributed along the perpendicular bisector of the fixation arms (100), and rod-shaped members being symmetrically inserted into the corresponding connecting holes to form a whole with the multiple fixation arms (100) forming a whole, and restraint mechanisms (103) being fixedly connected in the remaining connecting holes, and Kirschner wires (104) being connected between the symmetrical restraint mechanisms (103) on the same fixation arm (100). Its features are: The restraint mechanism (103) includes a fixing block (103a), a compression core sleeve (103b) is fixedly inserted into the upper surface of the fixing block (103a), and a first through hole (103a-1) is opened through the side of the fixing block (103a). After the Kirschner wire (104) passes through the fixing block (103a) through the first through hole (103a-1), the Kirschner wire (104) in the first through hole (103a-1) is compressed and fixed by the compression core sleeve (103b). The rod-shaped member includes a first screw (101), which is symmetrically distributed on the fixed arm (100). A first nut (101a) is threadedly connected to the first screw (101) on both sides of the fixed arm (100).

2. The miniature external fixation device for the treatment and teaching of open patellar fractures according to claim 1, characterized in that: A second through hole (103b-1) is provided on the side of the extrusion core sleeve (103b), and the diameter of the second through hole (103b-1) is equal to the diameter of the first through hole (103a-1). When the extrusion core sleeve (103b) is inserted into the fixing block (103a), the opening paths of the first through hole (103a-1) and the second through hole (103b-1) are in the same direction.

3. The miniature external fixation device for the treatment and teaching of open patellar fractures according to claim 2, characterized in that: A threaded sleeve (103a-2) is integrally connected to the other side of the fixing block (103a). The diameter of the threaded hole of the threaded sleeve (103a-2) is the same as the diameter of the pin hole. A stud (103c) is threadedly connected to the threaded sleeve (103a-2), and an end cap with a diameter larger than the pin hole diameter is integrally connected to the end of the stud (103c).

4. The miniature external fixation device for the treatment and teaching of open patellar fractures according to claim 1, characterized in that: The rod-shaped member also includes a second screw (102), which is also symmetrically distributed on the fixed arm (100). A second nut (102a) is threaded onto the second screw (102) and located on both sides of the fixed arm (100).

5. The miniature external fixation device for the treatment and teaching of open patellar fractures according to any one of claims 1-4, characterized in that: The connecting holes that connect to the first screw (101) are upper holes that are symmetrically and equidistantly distributed downward along the top of the fixed arm (100). The connecting holes that connect to the second screw (102) are lower holes that are symmetrically and equidistantly distributed upward along both ends of the bottom of the fixed arm (100). The connecting hole located between the upper hole and the lower hole is a pinhole for connecting with the restraint mechanism (103).

6. The miniature external fixation device for the treatment and teaching of open patellar fractures according to claim 1, characterized in that: The fixed arm (100) has a semi-ring structure.

Images