Miniature orthopedic external fixation support

Abstract

The utility model discloses a miniature orthopedic external fixation support, which belongs to the field of medical instruments and is provided with a universal joint, a connecting rod and needle rod clamps, one end of the connecting rod is provided with a ball head, the other end of the connecting rod is provided with a rod, a plurality of needle rod clamps are arranged on the rod, and the universal joint is provided with a clamping block A, a clamping block B and a fastening bolt. The ball heads of the two connecting rods are arranged between the combination faces of the clamping block A and the clamping block B respectively, the rods of the two connecting rods extend outwards respectively and swing by a certain angle relative to the universal joint respectively, the fastening bolt penetrates through the clamping block B and is screwed on the clamping block A, and the two connecting rods are connected and fixed. The clamping block A and the clamping block B are respectively provided with a pair of ball sockets for placing two connecting rod ball heads on the joint surfaces, the two fastening bolts are respectively arranged on two sides of a connecting line of two ball centers, and a vertical bisector of the connecting line of the two ball centers and a connecting line of axes of the two fastening bolts are arranged in a non-vertical crossing manner.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of medical apparatus and instruments, especially a micro orthopedics external fixing support. BACKGROUND

[0002] The number of phalangeal fracture patients accounts for a high proportion in trauma cases, since the phalanges are short and have many joints, the orthopedics external fixing support for treating phalangeal fracture at the joint part is the first choice of medical apparatus and instruments, and needs a smaller shape and lighter weight. However, the fastening performance cannot be small, and it needs to be adjusted in multiple directions during the operation, and it is flexible and convenient.

[0003] The phalangeal external fixing supports on the market now, such as the micro phalangeal fracture reduction external fixing frame disclosed in application No. 201720884723.1, cannot be bent at an angle although the shape is small, and are not suitable for cross-joint fixation. Also, the single-arm integrated orthopedics external fixing support disclosed in application No. CN202321383855.8 can be bent at an angle, but the structure is complex and the shape is large, and when the volume needs to be reduced, the fixing firmness will be affected, and it is not suitable for the fixation of phalangeal fracture. UTILITY MODEL CONTENT

[0004] The utility model discloses a micro orthopedics external fixing support, which overcomes the above-mentioned defects.

[0005] The micro orthopedics external fixing support is provided with a universal joint, connecting rods and needle rod clamps, one end of the connecting rod is provided with a ball head, the other end is provided as a rod, a plurality of needle rod clamps are arranged on the rod, the needle rod clamps are used for clamping bone pins, the universal joint is provided with clamp block A, clamp block B and a fastening bolt, the ball heads of the two connecting rods are respectively arranged between the combined surfaces of clamp block A and clamp block B, the rods of the two connecting rods respectively extend outward and swing by a certain angle relative to the universal joint, the fastening bolt penetrates through clamp block B and is screwed on clamp block A to connect and fix the two connecting rods, clamp block A and clamp block B are respectively provided with a pair of ball sockets for placing the ball heads of the two connecting rods on the combined surfaces thereof, in order to minimize the distance between the ball heads of the two connecting rods and reduce the shape size of the universal joint in the direction of the two ball centers, the fastening bolt is provided with two pieces, which are respectively arranged on the two sides of the line connecting the two ball centers, and the feature lies in that the line connecting the axes of the two fastening bolts and the perpendicular bisector of the two ball centers is non-perpendicularly intersected.

[0006] Further, the axes of the two fastening bolts are respectively arranged on the two sides of the perpendicular bisector of the two ball center lines, and the perpendicular bisector is arranged in the plane formed by the two ball center lines and parallel to the combined surface of clamp block A, so that the line connecting the axes of the two fastening bolts and the two ball center lines are non-perpendicularly intersected in the same plane.

[0007] Beneficial Effects: This invention, by placing two fastening bolts on both sides of the line connecting the two ball centers, reduces the distance between the two ball heads, thereby minimizing the overall dimensions of the universal joint in the direction of the line connecting the two ball centers. This creates a closer distance for needle insertion on both sides of the metacarpophalangeal joint, reducing the torque against postoperative external forces. Furthermore, by placing the axes of the two fastening bolts on both sides of the perpendicular bisector of the line connecting the two ball centers, the perpendicular bisector of the line connecting the two ball centers intersects the line connecting the axes of the two fastening bolts in a non-perpendicular manner. This allows one fastening bolt to be closer to one ball head and the other to be closer to the other ball head, increasing the locking effect of the universal joint on the two ball heads. Otherwise, if the axes of the two fastening bolts are placed on the perpendicular bisector of the line connecting the two ball centers, only one ball head will be locked, while the other ball head will loosen, thus reducing the stability and firmness of the fixation frame. The reason is that the external dimensions of the two ball heads produced under normal processing conditions are deviated. When the axis of the two fastening bolts is located on the perpendicular bisector of the line connecting the two ball centers, the distance from the two ball centers to the same bolt is equal. When the distance between the two ball centers is close, the clamping end face of the bolt head will approach or cover the ball centers of the two ball heads. The direction of the clamping force borne by the ball head passes directly through the ball center. Therefore, the ball with a larger diameter will be clamped more tightly, and the ball with a smaller diameter will be clamped more loosely, resulting in a defect of insecure fixation. At the same time, due to the processing deviation of the four ball sockets, there is also a hidden danger of aggravating the above-mentioned defect of insecure fixation. Attached Figure Description

[0008] Fig. 1 This is a schematic diagram of an embodiment of a miniature orthopedic external fixation device.

[0009] Fig. 2 This is a schematic diagram of the internal structure of a universal joint.

[0010] Fig. 3 This is a schematic diagram of the structure of clamping block B.

[0011] Explanation of reference numerals in the attached drawings: Universal joint 1, connecting rod 2, needle bar clamp 3, clamping block A11, clamping block B12, fastening bolt 13, ball socket 111. Detailed Implementation

[0012] Figs. 1-3This illustration shows the specific structure of a miniature orthopedic external fixator according to an embodiment of the present invention. The miniature orthopedic external fixator includes a universal joint 1, connecting rods 2, and pin clamps 3. One end of the connecting rod 2 has a ball head, and the other end is a rod. Multiple pin clamps 3 are mounted on the rod and are used to hold bone pins. The universal joint includes clamping blocks A11 and B12, and fastening bolts 13. The ball heads of two connecting rods 2 are respectively located between the mating surfaces of clamping blocks A11 and B12. The rods of the two connecting rods 2 extend outwards and swing at a certain angle relative to the universal joint 1. The fastening bolt 13 passes through the clamping block B12 and is tightened onto the clamping block A11 to connect and fix the two connecting rods 2. The clamping block A11 and the clamping block B12 are respectively provided with a pair of ball sockets 111 on their mating surfaces for placing the ball heads of the two connecting rods. In order to minimize the distance between the ball heads of the two connecting rods and reduce the external dimensions of the universal joint 1 in the direction of the line connecting the two ball centers, two fastening bolts 13 are provided, respectively located on both sides of the line connecting the two ball centers. The perpendicular bisector of the line connecting the two ball centers is not perpendicular to the line connecting the axes of the two fastening bolts 13.

[0013] Furthermore, the axes of the two fastening bolts 13 are respectively located on both sides of the vertical bisector of the line connecting the centers of the two balls. The vertical bisector is located in the plane formed by the line connecting the centers of the two balls and parallel to the mating surface of the clamping block A11, so that the line connecting the axes of the two fastening bolts 13 in the same plane intersects the line connecting the centers of the two balls in a non-perpendicular manner.

[0014] Furthermore, the rod is configured as a screw, and the needle clamp 3 is screwed onto the screw. Rotating the screw causes the needle clamp 3 to move along the screw axis.

Claims

1. A miniature orthopedic external fixator, comprising a universal joint (1), a connecting rod (2), and a pin clamp (3), wherein one end of the connecting rod (2) is provided with a ball head and the other end is provided with a rod, and multiple pin clamps (3) are provided on the rod, wherein the pin clamps (3) are used to clamp bone pins, the universal joint is provided with clamping block A (11), clamping block B (12), and fastening bolt (13), wherein the ball heads of the two connecting rods (2) are respectively provided between the mating surfaces of clamping block A (11) and clamping block B (12). The rods of the two connecting rods (2) extend outwards respectively and swing at a certain angle relative to the universal joint (1). The fastening bolt (13) passes through the clamping block B (12) and is tightened on the clamping block A (11) to connect and fix the two connecting rods (2). The clamping block A (11) and the clamping block B (12) are respectively provided with a pair of ball sockets (111) on their mating surfaces for placing the ball heads of the two connecting rods. There are two fastening bolts, which are respectively located on both sides of the line connecting the centers of the two balls. The characteristic is that... The perpendicular bisector of the line connecting the centers of the two balls intersects the line connecting the axes of the two fastening bolts (13) in a non-perpendicular manner.

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